Real Estate Acquisitions and Dispositions - Real Estate Acquisitions - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($) ft²	Sep. 30, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square footage (in square feet) \| ft²	2,800,000	2,800,000
ROU asset	$ 380	$ 380	$ 139
Operating lease, liability, statement of financial position	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Operating lease, right-of-use asset, statement of financial position	us-gaap:OtherAssets	us-gaap:OtherAssets
Columbus, IN
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
ROU asset	$ 200	$ 200
Future lease payments	200	200
Acquisition Of Properties In 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		59,299
Cash Consideration		58,945
Real Estate	$ 59,682	59,682
Other		$ (737)
Square footage (in square feet) \| ft²	213,376	213,376
Acquisition Of Properties During 1st Quarter 2020 \| San Antonio, TX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 4,003
Cash Consideration		4,022
Real Estate	$ 4,036	4,036
Other		$ (14)
Square footage (in square feet) \| ft²	13,500	13,500
Acquisition Of Properties During 1st Quarter 2020 \| San Antonio, TX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 1,931
Cash Consideration		1,955
Real Estate	$ 1,961	1,961
Other		$ (6)
Square footage (in square feet) \| ft²	6,500	6,500
Acquisition Of Properties During 1st Quarter 2020 \| Decatur, AL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 5,784
Cash Consideration		5,792
Real Estate	$ 5,777	5,777
Other		$ 15
Square footage (in square feet) \| ft²	35,943	35,943
Acquisition Of Properties During 1st Quarter 2020 \| Ramona, CA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 4,100
Cash Consideration		4,124
Real Estate	$ 4,143	4,143
Other		$ (19)
Square footage (in square feet) \| ft²	11,300	11,300
Acquisition Of Properties During 1st Quarter 2020 \| Cuero, TX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 2,153
Cash Consideration		2,174
Real Estate	$ 2,207	2,207
Other		$ (33)
Square footage (in square feet) \| ft²	15,515	15,515
Acquisition Of Properties During 1st Quarter 2020 \| Rogers, AR
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 19,000
Cash Consideration		18,317
Real Estate	$ 19,042	19,042
Other		$ (725)
Square footage (in square feet) \| ft²	38,817	38,817
Acquisition Of Properties During 2nd Quarter 2020 \| Oak Lawn, IL (Land)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 400
Cash Consideration		403
Real Estate	$ 421	421
Other		$ (18)
Square footage (in square feet) \| ft²	0	0
Acquisition Of Properties During 2nd Quarter 2020 \| Germantown, TN
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 3,900
Cash Consideration		3,949
Real Estate	$ 3,949	3,949
Other		$ 0
Square footage (in square feet) \| ft²	10,600	10,600
Acquisition Of Properties During 2nd Quarter 2020 \| Westlake, OH
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 2,443
Cash Consideration		2,456
Real Estate	$ 2,487	2,487
Other		$ (31)
Square footage (in square feet) \| ft²	15,057	15,057
Acquisition Of Properties During 2nd Quarter 2020 \| Columbus, IN
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 1,813
Cash Consideration		1,828
Real Estate	$ 1,787	1,787
Other		$ 41
Square footage (in square feet) \| ft²	13,969	13,969
Acquisition Of Properties During 2nd Quarter 2020 \| Niceville, FL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 2,294
Cash Consideration		2,340
Real Estate	$ 2,344	2,344
Other		$ (4)
Square footage (in square feet) \| ft²	10,250	10,250
Acquisition Of Properties During 2nd Quarter 2020 \| Greensburg, PA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 3,389
Cash Consideration		3,484
Real Estate	$ 3,497	3,497
Other		$ (13)
Square footage (in square feet) \| ft²	15,650	15,650
Acquisition Of Properties During 2nd Quarter 2020 \| Gardendale, AL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 2,948
Cash Consideration		2,935
Real Estate	$ 2,878	2,878
Other		$ 57
Square footage (in square feet) \| ft²	12,956	12,956
Acquisition Of Properties During 2nd Quarter 2020 \| Prattville, AL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price		$ 4,091
Cash Consideration		4,111
Real Estate	$ 4,078	4,078
Other		$ 33
Square footage (in square feet) \| ft²	13,319	13,319
Acquisition Of Properties During 3rd Quarter 2020 \| Jensen Beach, FL (Land)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase Price	$ 1,100	$ 1,050
Cash Consideration		1,055
Real Estate	$ 1,075	1,075
Other		$ (20)
Square footage (in square feet) \| ft²	0	0

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