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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Property Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Investments in Real Estate |  |
Balance, beginning of period | $ 637,205 | $ 629,262
Additions: |  |
Improvements | 5,907 | 9,335
Property acquisitions | 2,933 | 5,709
Deductions: |  |
Assets held for sale | 0 | 0
Asset sales | 0 | 0
Impairment | 0 | 0
Retirements | (3,343) | (7,101)
Balance, end of period | 642,702 | 637,205
Accumulated Depreciation |  |
Balance, beginning of period | (131,165) | (120,555)
Additions: depreciation | (16,896) | (17,711)
Assets held for sale | 0 | 0
Asset sales | 0 | 0
Retirements | 3,343 | 7,101
Balance, end of period | $ (144,718) | $ (131,165)

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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