Property Portfolio - Gross Investment (Details)

v3.21.1

Property Portfolio - Gross Investment (Details) - USD ($) $ in Thousands																				3 Months Ended	12 Months Ended
	Jan. 15, 2021	Jan. 12, 2021	Dec. 30, 2020	Dec. 29, 2020	Dec. 14, 2020	Dec. 01, 2020	Nov. 23, 2020	Nov. 18, 2020	Oct. 27, 2020	Oct. 20, 2020	Sep. 30, 2020	Sep. 18, 2020	Jul. 31, 2020	Jul. 17, 2020	Jul. 16, 2020	Mar. 20, 2020	Mar. 04, 2020	Feb. 27, 2020	Feb. 13, 2020	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Beginning Balance																				$ 1,142,905	$ 905,529
Acquisitions																				43,570	237,376
Capitalized costs																				134	1,799
Ending Balance																				1,186,475	1,142,905
High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																			$ 25,100		25,081
Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		$ 11,600			11,619
West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																	$ 9,100				9,357
Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																$ 22,700					22,794
Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				22,040
Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions															$ 5,100						5,071
Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions														$ 17,900							19,745
Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions													$ 23,100								23,891
Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions												$ 6,300									6,305
Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions											$ 8,500										9,240
Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions										$ 10,900											10,912
Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions									$ 13,800												13,824
Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions								$ 18,200													18,218
Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions							$ 7,400														7,350
Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions						$ 7,000															6,979
Las Vegas Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions					$ 7,100																7,124
Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions				$ 9,100																	9,052
Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions			$ 7,000																		6,975
El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions		$ 10,000																		10,017
Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions	$ 6,200																			6,397
West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions	$ 9,600																			9,578
Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				17,444
Land [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																				128,857	95,381
Acquisitions																				4,183	33,476
Ending Balance																				133,040	128,857
Land [Member] | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,749
Land [Member] | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					664
Land [Member] | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					974
Land [Member] | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,951
Land [Member] | Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				2,597
Land [Member] | Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					6,731
Land [Member] | Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,856
Land [Member] | Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					696
Land [Member] | Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,524
Land [Member] | Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,237
Land [Member] | Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,088
Land [Member] | Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					3,473
Land [Member] | Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,150
Land [Member] | Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,041
Land [Member] | Las Vegas Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					311
Land [Member] | Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,786
Land [Member] | Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,648
Land [Member] | El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				899
Land [Member] | Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				616
Land [Member] | West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				851
Land [Member] | Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				1,817
Buildings
Property, Plant and Equipment [Line Items]
Beginning Balance																				851,427	693,533
Acquisitions																				32,474	157,894
Capitalized costs																					1,230
Ending Balance																				883,901	851,427
Buildings | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					20,367
Buildings | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					6,551
Buildings | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					7,687
Buildings | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					17,341
Buildings | Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				10,047
Buildings | Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					4,202
Buildings | Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					6,642
Buildings | Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					16,204
Buildings | Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					4,269
Buildings | Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					6,407
Buildings | Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					7,140
Buildings | Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					11,212
Buildings | Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					12,520
Buildings | Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					4,601
Buildings | Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					4,715
Buildings | Las Vegas Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					6,813
Buildings | Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					5,742
Buildings | Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					4,204
Buildings | El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				7,549
Buildings | Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				4,745
Buildings | West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				7,160
Buildings | Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				13,020
Site Improvements [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																				15,183	9,912
Acquisitions																				486	5,271
Capitalized costs																					203
Ending Balance																				15,669	15,183
Site Improvements [Member] | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					440
Site Improvements [Member] | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					342
Site Improvements [Member] | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					137
Site Improvements [Member] | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					470
Site Improvements [Member] | Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				289
Site Improvements [Member] | Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					160
Site Improvements [Member] | Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					381
Site Improvements [Member] | Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					567
Site Improvements [Member] | Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					110
Site Improvements [Member] | Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					254
Site Improvements [Member] | Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					284
Site Improvements [Member] | Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					253
Site Improvements [Member] | Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					420
Site Improvements [Member] | Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					73
Site Improvements [Member] | Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					309
Site Improvements [Member] | Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					332
Site Improvements [Member] | Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					247
Site Improvements [Member] | El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				71
Site Improvements [Member] | Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				128
Site Improvements [Member] | West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				144
Site Improvements [Member] | Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				143
Tenant improvements [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																				49,204	33,909
Acquisitions																				1,392	15,295
Capitalized costs																				134	194
Ending Balance																				50,596	49,204
Tenant improvements [Member] | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					869
Tenant improvements [Member] | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,578
Tenant improvements [Member] | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					98
Tenant improvements [Member] | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					450
Tenant improvements [Member] | Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				4,815
Tenant improvements [Member] | Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					208
Tenant improvements [Member] | Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,979
Tenant improvements [Member] | Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,443
Tenant improvements [Member] | Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					116
Tenant improvements [Member] | Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					307
Tenant improvements [Member] | Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					296
Tenant improvements [Member] | Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					225
Tenant improvements [Member] | Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					435
Tenant improvements [Member] | Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					264
Tenant improvements [Member] | Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					274
Tenant improvements [Member] | Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					411
Tenant improvements [Member] | Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					333
Tenant improvements [Member] | El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				160
Tenant improvements [Member] | Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				136
Tenant improvements [Member] | West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				567
Tenant improvements [Member] | Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				395
Intangibles [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																				98,234	72,794
Acquisitions																				5,035	25,440
Capitalized costs																					172
Ending Balance																				103,269	98,234
Intangibles [Member] | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,656
Intangibles [Member] | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,484
Intangibles [Member] | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					461
Intangibles [Member] | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,582
Intangibles [Member] | Dumfries [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				4,292
Intangibles [Member] | Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					501
Intangibles [Member] | Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					3,012
Intangibles [Member] | Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					2,821
Intangibles [Member] | Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,114
Intangibles [Member] | Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					748
Intangibles [Member] | Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					955
Intangibles [Member] | Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,046
Intangibles [Member] | Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,370
Intangibles [Member] | Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					1,262
Intangibles [Member] | Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					640
Intangibles [Member] | Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					781
Intangibles [Member] | Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					$ 543
Intangibles [Member] | El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				1,338
Intangibles [Member] | Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				772
Intangibles [Member] | West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				856
Intangibles [Member] | Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				$ 2,069