Quarterly report pursuant to Section 13 or 15(d)

Property Portfolio (Gross Investment) (Details)

v3.8.0.1
Property Portfolio (Gross Investment) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 02, 2018
Apr. 19, 2018
Feb. 23, 2018
Mar. 31, 2018
Property, Plant and Equipment [Line Items]        
Beginning Balance       $ 471,507
Acquisitions   $ 64,200   65,804
Ending Balance       537,311
Cape Coral Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       7,100
Lewisburg facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       8,497
Las Cruces Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       10,510
Prescott Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       23,284
Clermont Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       16,414
Gainesville Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions     $ 10,500  
Dallas Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions $ 23,300      
Land [Member]        
Property, Plant and Equipment [Line Items]        
Beginning Balance       42,701
Acquisitions       9,600
Ending Balance       52,301
Land [Member] | Moline / Silvis Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Land [Member] | Freemont Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       162
Land [Member] | Gainesville Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       625
Land [Member] | Dallas Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       6,272
Land [Member] | Orlando Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       2,543
Building [Member]        
Property, Plant and Equipment [Line Items]        
Beginning Balance       384,338
Acquisitions       51,847
Ending Balance       436,185
Building [Member] | Moline / Silvis Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       4,895
Building [Member] | Freemont Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       8,335
Building [Member] | Gainesville Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       9,885
Building [Member] | Dallas Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       17,012
Building [Member] | Orlando Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       11,720
Site And Tenant Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Beginning Balance       12,818
Acquisitions       1,973
Ending Balance       14,791
Site And Tenant Improvements [Member] | Moline / Silvis Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       1,216
Site And Tenant Improvements [Member] | Freemont Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Site And Tenant Improvements [Member] | Gainesville Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Site And Tenant Improvements [Member] | Dallas Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Site And Tenant Improvements [Member] | Orlando Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       756
Intangibles [Member]        
Property, Plant and Equipment [Line Items]        
Beginning Balance       31,650
Acquisitions       2,384
Ending Balance       34,034
Intangibles [Member] | Moline / Silvis Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       989
Intangibles [Member] | Freemont Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Intangibles [Member] | Gainesville Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Intangibles [Member] | Dallas Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       0
Intangibles [Member] | Orlando Facility [Member]        
Property, Plant and Equipment [Line Items]        
Acquisitions       $ 1,395