Property Portfolio - (Details)

v3.21.2

Property Portfolio - (Details) $ in Thousands																												3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 02, 2021 USD ($) lease	Apr. 21, 2021 USD ($)	Apr. 19, 2021 USD ($) property lease	Apr. 16, 2021 USD ($) lease	Apr. 13, 2021 USD ($) lease property	Apr. 06, 2021 USD ($) lease	Mar. 09, 2021 USD ($)	Jan. 15, 2021 USD ($) property lease	Jan. 12, 2021 USD ($) lease	Dec. 30, 2020 USD ($) item property lease	Dec. 29, 2020 USD ($) property lease tenant	Dec. 14, 2020 USD ($) lease property	Dec. 01, 2020 USD ($) lease property	Nov. 23, 2020 USD ($)	Nov. 18, 2020 USD ($) lease property	Oct. 27, 2020 USD ($) lease property tenant	Oct. 20, 2020 USD ($) property lease tenant	Sep. 30, 2020 USD ($) lease	Sep. 18, 2020 USD ($)	Jul. 31, 2020 USD ($) tenant lease	Jul. 17, 2020 USD ($)	Jul. 16, 2020 USD ($)	Apr. 27, 2020 USD ($)	Mar. 20, 2020 USD ($) lease building	Mar. 04, 2020 USD ($)	Feb. 27, 2020 USD ($)	Feb. 13, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) item
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | item																														11		18
Depreciation, Total																												$ 8,292	$ 6,593	$ 16,140	$ 12,429
Tenant Improvement Allowances Receivable																												28,400		28,400
Capital Lease Obligations, Noncurrent																												$ 18,000		18,000
Acquisitions							$ 17,400																							$ 117,419		$ 237,376
Debt Instrument, Term																														4 years 8 months 15 days		2 years 9 months 14 days
Weighted average remaining term																												41 years		41 years
Commercial mortgage-backed securities (CMBS)
Property, Plant and Equipment [Line Items]
Debt Instrument, Face Amount																							$ 12,100
Debt Instrument, Interest Rate, Stated Percentage																							4.68%
Debt Instrument, Term																							4 years
Lease Intangibles Asset [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life																														5 years 3 months 18 days
Lease Intangibles Liability [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life																														4 years 6 months
Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														$ 16,567		$ 33,476
El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions									$ 10,000																					10,017
Number or leases assumed | lease									3
Lessor, Operating Lease, Term of Contract									4 years
El Paso Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														899
Syracuse Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions								$ 6,200																						6,397
Number or leases assumed | lease								2
Lessor, Operating Lease, Term of Contract								8 years
Syracuse Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														616
West El Paso Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property								2
Acquisitions								$ 9,600																						9,578
Number of new leases entered into | lease								2
Lessor, Operating Lease, Term of Contract								12 years
Leases with tenant renewal options | lease								3
Weighted average remaining term								7 years
West El Paso Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														851
Fort Worth Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														17,444
Fort Worth Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														1,817
Port St. Lucie Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions						$ 4,800																								4,787
Number or leases assumed | lease						2
Weighted average remaining term						6 years
Port St. Lucie Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														590
Cape Coral and Fort Myers Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property					6
Acquisitions					$ 31,700																									31,701
Number or leases assumed | lease					6
Weighted average remaining term					5 years
Cape Coral and Fort Myers Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														5,623
Dallas Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions				$ 6,400																										6,719
Number or leases assumed | lease				2
Weighted average remaining term				7 years
Dallas Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														3,101
East Grand Forks Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property			2
Acquisitions			$ 9,700																											10,278
Number or leases assumed | lease			2
Weighted average remaining term			4 years
East Grand Forks Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														845
Coos Bay Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions		$ 6,500																												6,472
Weighted average remaining term		3 years
Coos Bay Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														861
Caledonia Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions	$ 3,900																													3,910
Number or leases assumed | lease	4
Weighted average remaining term	4 years
Caledonia Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														582
Tallahassee Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions	$ 9,200																													9,244
Number or leases assumed | lease	2
Weighted average remaining term	9 years
Tallahassee Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																														$ 782
High Point Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																											$ 25,100					25,081
Lessor, Operating Lease, Term of Contract																											3 years
High Point Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,749
Clinton Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																										$ 11,600						11,619
Lessor, Operating Lease, Term of Contract																										4 years
Clinton Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																664
West Allis Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																									$ 9,100							9,357
Lessor, Operating Lease, Term of Contract																									4 years
West Allis Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																974
Grand Rapids Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | building																								4
Acquisitions																								$ 22,700								22,794
Number or leases assumed | lease																								11
Lessor, Operating Lease, Term of Contract																								5 years
Grand Rapids Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																2,951
Dumfries Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																							$ 19,600
Lessor, Operating Lease, Term of Contract																							9 years 6 months
Centerville Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																						$ 5,100										5,071
Lessor, Operating Lease, Term of Contract																						10 years 6 months
Centerville Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Weighted average remaining term																						49 years
Fairfax Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																					$ 17,900											19,745
Lessor, Operating Lease, Term of Contract																					9 years 1 month 6 days
Fairfax Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																6,731
Rosedale Facilities [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																				$ 23,100												23,891
Debt Instrument, Face Amount																				$ 14,800
Debt Instrument, Interest Rate, Stated Percentage																				3.85%
Debt Instrument, Term																				5 years
Number or leases assumed | lease																				8
Number of tenants assumed | tenant																				6
Lessor, Operating Lease, Term of Contract																				6 years 7 months 6 days
Rosedale Facilities [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																2,856
Lancaster Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																			$ 6,300													6,305
Lessor, Operating Lease, Term of Contract																			8 years 6 months
Lancaster Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																696
Winston-Salem Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																		$ 8,500														9,240
Number or leases assumed | lease																		5
Lessor, Operating Lease, Term of Contract																		4 years
Winston-Salem Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,524
Decatur and Jackson Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																	2
Acquisitions																	$ 10,900															10,912
Number or leases assumed | lease																	6
Number of tenants assumed | tenant																	5
Weighted average remaining term																	6 years
Decatur and Jackson Facility [Member] | Decatur [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																	1
Decatur and Jackson Facility [Member] | Jackson [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																	1
Decatur and Jackson Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																2,237
Sheboygan and Plymouth Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																2
Acquisitions																$ 13,800																13,824
Number or leases assumed | lease																3
Number of tenants assumed | tenant																2
Weighted average remaining term																5 years
Sheboygan and Plymouth Facility [Member] | Sheboygan [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																1
Sheboygan and Plymouth Facility [Member] | Plymouth [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property																1
Sheboygan and Plymouth Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,088
Spring Hill and Hudson Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property															3
Acquisitions															$ 18,200																	18,218
Number or leases assumed | lease															3
Lessor, Operating Lease, Term of Contract															8 years
Spring Hill and Hudson Facility [Member] | Spring Hill [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property															2
Spring Hill and Hudson Facility [Member] | Hudson [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property															1
Spring Hill and Hudson Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																3,473
Cape Girardeau Facility [Member]
Property, Plant and Equipment [Line Items]
Acquisitions														$ 7,400																		7,350
Lessor, Operating Lease, Term of Contract														6 years
Cape Girardeau Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,150
Yuma Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property													2
Acquisitions													$ 7,000																			6,979
Number or leases assumed | lease													2
Weighted average remaining term													4 years
Yuma Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,041
Las Vegas Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property												2
Acquisitions												$ 7,100																				7,124
Number of new leases entered into | lease												2
Lessor, Operating Lease, Term of Contract												12 years
Las Vegas Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																311
Pensacola Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property											3
Acquisitions											$ 9,100																					9,052
Number or leases assumed | lease											3
Number of tenants assumed | tenant											2
Weighted average remaining term											9 years
Pensacola Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																1,786
Venice Facility [Member]
Property, Plant and Equipment [Line Items]
Number of Properties Acquired | property										2
Acquisitions										$ 7,000																						6,975
Number or leases assumed | lease										2
Lessor, Operating Lease, Term of Contract										5 years 6 months
Leases with tenant renewal options | item										0
Venice Facility [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Acquisitions																																$ 1,648