Property Portfolio - Gross Investment (Details)

v3.20.1

Property Portfolio - Gross Investment (Details) - USD ($) $ in Thousands																	3 Months Ended	12 Months Ended
	Mar. 20, 2020	Mar. 04, 2020	Feb. 27, 2020	Feb. 13, 2020	Dec. 17, 2019	Nov. 15, 2019	Oct. 31, 2019	Oct. 25, 2019	Oct. 01, 2019	Sep. 26, 2019	Aug. 23, 2019	Aug. 14, 2019	Aug. 06, 2019	Aug. 05, 2019	Aug. 01, 2019	Jul. 12, 2019	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Beginning Balance																	$ 905,529	$ 647,550
Acquisitions																	69,159	257,979
Capitalized costs																	312	1,860
Ending Balance																	974,688	905,529
Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		4,683
Gilbert and Chandler [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		16,259
Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		22,502
Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		28,207
Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		16,103
Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		28,682
San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																$ 12,000		11,974
Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions															$ 11,100			11,368
Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions														$ 6,800				6,977
Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions													$ 12,600					12,557
Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions												$ 10,400						10,592
Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions											$ 5,600							5,592
Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions										$ 8,000								7,950
Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions									$ 33,700									33,739
Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions								$ 12,100										12,065
Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions							$ 13,000											12,976
Jacksonville [Member]
Property, Plant and Equipment [Line Items]
Acquisitions						$ 8,900												8,869
Greenwood [Member]
Property, Plant and Equipment [Line Items]
Acquisitions					$ 5,800													5,848
Asc 842 Reclassification [Member]
Property, Plant and Equipment [Line Items]
ASC Topic 842 Reclassification																		(824)
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																22,790
Land [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																	95,381	63,710
Acquisitions																	6,334	31,671
Capitalized costs																	0	0
Ending Balance																	101,715	95,381
Land [Member] | Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Land [Member] | Gilbert and Chandler [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		4,616
Land [Member] | Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,479
Land [Member] | Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,364
Land [Member] | Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,924
Land [Member] | Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,738
Land [Member] | San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,322
Land [Member] | Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,202
Land [Member] | Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		763
Land [Member] | Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,521
Land [Member] | Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		980
Land [Member] | Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,408
Land [Member] | Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		883
Land [Member] | Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,022
Land [Member] | Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,975
Land [Member] | Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,559
Land [Member] | Jacksonville [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,023
Land [Member] | Greenwood [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		892
Land [Member] | Asc 842 Reclassification [Member]
Property, Plant and Equipment [Line Items]
ASC Topic 842 Reclassification																		0
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																	2,947
Building [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																	693,533	518,451
Acquisitions																	52,116	175,082
Capitalized costs																	170	1,179
Ending Balance																	745,649	693,533
Building [Member] | Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,336
Building [Member] | Gilbert and Chandler [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		11,643
Building [Member] | Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		15,277
Building [Member] | Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		19,501
Building [Member] | Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		10,084
Building [Member] | Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		18,737
Building [Member] | San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		6,934
Building [Member] | Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		7,681
Building [Member] | Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,566
Building [Member] | Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		7,446
Building [Member] | Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		7,629
Building [Member] | Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,027
Building [Member] | Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		5,286
Building [Member] | Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		24,836
Building [Member] | Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		8,436
Building [Member] | Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		8,682
Building [Member] | Jacksonville [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		7,846
Building [Member] | Greenwood [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		4,956
Building [Member] | Asc 842 Reclassification [Member]
Property, Plant and Equipment [Line Items]
ASC Topic 842 Reclassification																		0
Building [Member] | High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																	20,367
Building [Member] | Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																	6,551
Building [Member] | West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																	7,687
Building [Member] | Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																	17,341
Site Improvements [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																	9,912	6,880
Acquisitions																	1,391	3,032
Capitalized costs																	2	170
Ending Balance																	11,303	9,912
Site Improvements [Member] | Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		103
Site Improvements [Member] | Gilbert and Chandler [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Site Improvements [Member] | Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		244
Site Improvements [Member] | Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		143
Site Improvements [Member] | Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		74
Site Improvements [Member] | Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		228
Site Improvements [Member] | San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		126
Site Improvements [Member] | Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		185
Site Improvements [Member] | Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		132
Site Improvements [Member] | Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		308
Site Improvements [Member] | Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		201
Site Improvements [Member] | Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		62
Site Improvements [Member] | Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		373
Site Improvements [Member] | Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		399
Site Improvements [Member] | Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		64
Site Improvements [Member] | Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		220
Site Improvements [Member] | Jacksonville [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Site Improvements [Member] | Greenwood [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Site Improvements [Member] | Asc 842 Reclassification [Member]
Property, Plant and Equipment [Line Items]
ASC Topic 842 Reclassification																		0
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
Tenant improvements [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																	33,909	15,357
Acquisitions																	3,135	18,552
Capitalized costs																	140	511
Ending Balance																	37,044	33,909
Tenant improvements [Member] | Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		409
Tenant improvements [Member] | Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,205
Tenant improvements [Member] | Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,044
Tenant improvements [Member] | Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,798
Tenant improvements [Member] | Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		4,119
Tenant improvements [Member] | San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		404
Tenant improvements [Member] | Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		667
Tenant improvements [Member] | Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,134
Tenant improvements [Member] | Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		603
Tenant improvements [Member] | Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		442
Tenant improvements [Member] | Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		362
Tenant improvements [Member] | Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		506
Tenant improvements [Member] | Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,036
Tenant improvements [Member] | Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		276
Tenant improvements [Member] | Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,036
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
Intangibles [Member]
Property, Plant and Equipment [Line Items]
Beginning Balance																	72,794	43,152
Acquisitions																	6,183	29,642
Capitalized costs																	0	0
Ending Balance																	78,977	72,794
Intangibles [Member] | Zachary [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		835
Intangibles [Member] | Gilbert and Chandler [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Intangibles [Member] | Las Vegas [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,297
Intangibles [Member] | Oklahoma Northwest [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,155
Intangibles [Member] | Mishawaka [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,223
Intangibles [Member] | Surprise [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		3,860
Intangibles [Member] | San Marcos [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,188
Intangibles [Member] | Lansing [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,633
Intangibles [Member] | Bannockburn [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,382
Intangibles [Member] | Aurora [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		2,679
Intangibles [Member] | Livonia [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,340
Intangibles [Member] | Gilbert [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		733
Intangibles [Member] | Morgantown [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		902
Intangibles [Member] | Beaumont [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		4,446
Intangibles [Member] | Bastrop [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,314
Intangibles [Member] | Panama City [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		1,479
Intangibles [Member] | Jacksonville [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Intangibles [Member] | Greenwood [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		0
Intangibles [Member] | Asc 842 Reclassification [Member]
Property, Plant and Equipment [Line Items]
ASC Topic 842 Reclassification																		$ (824)
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