Annual report pursuant to Section 13 and 15(d)

Property Portfolio (Gross Investment) (Details)

v3.8.0.1
Property Portfolio (Gross Investment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Beginning Balance $ 206,877 $ 56,138
Acquisitions 264,630 [1] 150,739 [2]
Ending Balance 471,507 206,877
Westland Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,750
Cape Coral Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 7,369  
Lewisburg facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 7,300  
Las Cruces Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,014  
Prescott Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,612  
Clermont Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,435  
Sandusky Facility Acquisition One [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,407  
Great Bend Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 24,638  
Oklahoma City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 49,500  
Sandusky Facility Acquisition Two [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,076  
Brockport Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 9,085  
Flower Mound Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,292  
Plano Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   17,746
Sherman facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 26,612  
Sandusky Facility Acquisition Three [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,271  
Lubbock Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 8,200  
Germantown Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 15,940  
Austin Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 40,650  
HealthSouth Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   68,152
Ellijay Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   5,120
Carson City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,029
Sandusky Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,748
Watertown Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   9,102
East Orange Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   12,262
Reading Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   9,380
Melbourne Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   15,450
Fort Worth [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 6,250  
Albertville [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 6,800  
Moline [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 12,007  
Lee’s Summit [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,937  
Amarillo [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 8,691  
Wyomissing [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,737  
Saint George [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,807  
Land [Member]    
Property, Plant and Equipment [Line Items]    
Beginning Balance 17,786 4,564
Acquisitions 24,915 [1] 13,222 [2]
Ending Balance 42,701 17,786
Land [Member] | Westland Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   230
Land [Member] | Cape Coral Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 352  
Land [Member] | Lewisburg facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 471  
Land [Member] | Las Cruces Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 396  
Land [Member] | Prescott Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 791  
Land [Member] | Clermont Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Land [Member] | Sandusky Facility Acquisition One [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 409  
Land [Member] | Great Bend Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 837  
Land [Member] | Oklahoma City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 2,087  
Land [Member] | Sandusky Facility Acquisition Two [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 98  
Land [Member] | Brockport Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 413  
Land [Member] | Flower Mound Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 581  
Land [Member] | Plano Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   1,050
Land [Member] | Sherman facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,601  
Land [Member] | Sandusky Facility Acquisition Three [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 56  
Land [Member] | Lubbock Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,303  
Land [Member] | Germantown Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 2,700  
Land [Member] | Austin Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 6,958  
Land [Member] | HealthSouth Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,285
Land [Member] | Ellijay Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   777
Land [Member] | Carson City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   761
Land [Member] | Sandusky Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   229
Land [Member] | Watertown Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   1,100
Land [Member] | East Orange Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   2,150
Land [Member] | Reading Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   1,440
Land [Member] | Melbourne Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   1,200
Land [Member] | Fort Worth [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,487  
Land [Member] | Albertville [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 866  
Land [Member] | Moline [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 722  
Land [Member] | Lee’s Summit [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 428  
Land [Member] | Amarillo [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,437  
Land [Member] | Wyomissing [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 487  
Land [Member] | Saint George [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 435  
Building [Member]    
Property, Plant and Equipment [Line Items]    
Beginning Balance 179,253 51,574
Acquisitions 205,085 [1] 127,679 [2]
Ending Balance 384,338 179,253
Building [Member] | Westland Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,520
Building [Member] | Cape Coral Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 7,017  
Building [Member] | Lewisburg facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,819  
Building [Member] | Las Cruces Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,618  
Building [Member] | Prescott Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,821  
Building [Member] | Clermont Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,361  
Building [Member] | Sandusky Facility Acquisition One [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,998  
Building [Member] | Great Bend Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 23,801  
Building [Member] | Oklahoma City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 37,714  
Building [Member] | Sandusky Facility Acquisition Two [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 978  
Building [Member] | Brockport Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 6,885  
Building [Member] | Flower Mound Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 2,922  
Building [Member] | Plano Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   16,696
Building [Member] | Sherman facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 25,011  
Building [Member] | Sandusky Facility Acquisition Three [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,215  
Building [Member] | Lubbock Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,042  
Building [Member] | Germantown Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 8,078  
Building [Member] | Austin Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 28,508  
Building [Member] | HealthSouth Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   55,443
Building [Member] | Ellijay Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   2,929
Building [Member] | Carson City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   3,268
Building [Member] | Sandusky Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   4,519
Building [Member] | Watertown Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   8,002
Building [Member] | East Orange Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   10,112
Building [Member] | Reading Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   7,940
Building [Member] | Melbourne Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   14,250
Building [Member] | Fort Worth [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,334  
Building [Member] | Albertville [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,486  
Building [Member] | Moline [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 8,175  
Building [Member] | Lee’s Summit [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 2,426  
Building [Member] | Amarillo [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 7,254  
Building [Member] | Wyomissing [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,250  
Building [Member] | Saint George [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 5,372  
Building And Tenant Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Beginning Balance 2,651 0
Acquisitions 10,167 [1] 2,651 [2]
Ending Balance 12,818 2,651
Building And Tenant Improvements [Member] | Westland Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Cape Coral Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Lewisburg facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 505  
Building And Tenant Improvements [Member] | Las Cruces Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Prescott Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Clermont Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 206  
Building And Tenant Improvements [Member] | Sandusky Facility Acquisition One [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Great Bend Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Oklahoma City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,876  
Building And Tenant Improvements [Member] | Sandusky Facility Acquisition Two [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Brockport Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 492  
Building And Tenant Improvements [Member] | Flower Mound Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 382  
Building And Tenant Improvements [Member] | Plano Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Sherman facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Sandusky Facility Acquisition Three [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Lubbock Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 947  
Building And Tenant Improvements [Member] | Germantown Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 657  
Building And Tenant Improvements [Member] | Austin Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,373  
Building And Tenant Improvements [Member] | HealthSouth Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   2,107
Building And Tenant Improvements [Member] | Ellijay Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   544
Building And Tenant Improvements [Member] | Carson City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Sandusky Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Watertown Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | East Orange Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Reading Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Melbourne Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Building And Tenant Improvements [Member] | Fort Worth [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 643  
Building And Tenant Improvements [Member] | Albertville [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,246  
Building And Tenant Improvements [Member] | Moline [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,194  
Building And Tenant Improvements [Member] | Lee’s Summit [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 646  
Building And Tenant Improvements [Member] | Amarillo [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Wyomissing [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Building And Tenant Improvements [Member] | Saint George [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member]    
Property, Plant and Equipment [Line Items]    
Beginning Balance 7,187 0
Acquisitions 24,463 [1] 7,187 [2]
Ending Balance 31,650 7,187
Intangibles [Member] | Westland Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Cape Coral Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Lewisburg facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 505  
Intangibles [Member] | Las Cruces Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Prescott Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Clermont Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 868  
Intangibles [Member] | Sandusky Facility Acquisition One [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Great Bend Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Oklahoma City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 7,823  
Intangibles [Member] | Sandusky Facility Acquisition Two [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Brockport Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,295  
Intangibles [Member] | Flower Mound Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 407  
Intangibles [Member] | Plano Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Sherman facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Sandusky Facility Acquisition Three [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Lubbock Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 908  
Intangibles [Member] | Germantown Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 4,505  
Intangibles [Member] | Austin Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 3,811  
Intangibles [Member] | HealthSouth Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   6,317
Intangibles [Member] | Ellijay Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   870
Intangibles [Member] | Carson City Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Sandusky Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Watertown Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | East Orange Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Reading Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   0
Intangibles [Member] | Melbourne Facility [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions   $ 0
Intangibles [Member] | Fort Worth [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 786  
Intangibles [Member] | Albertville [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,202  
Intangibles [Member] | Moline [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 1,916  
Intangibles [Member] | Lee’s Summit [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 437  
Intangibles [Member] | Amarillo [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Wyomissing [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions 0  
Intangibles [Member] | Saint George [Member]    
Property, Plant and Equipment [Line Items]    
Acquisitions $ 0  
[1] The Lubbock and Moline facility acquisitions included an aggregate of approximately $11,300 of OP Units issued as part of the total consideration. Additionally, an aggregate of $1,110 of intangible liabilities were acquired from the acquisitions that occurred during the year ended December 31, 2017, resulting in total gross investments funded using cash of $252,220
[2] An aggregate of $280 of intangible liabilities were acquired from the acquisitions that occurred during the year ended December 31, 2016, resulting in total gross investments funded using cash of $150,459.