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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investment in real estate: |  |  |
Balance, beginning of year | $ 839,058 | $ 835,837 | $ 829,143
Addition: Land, buildings and improvements | 28,837 | 26,444 | 49,669
Deduction: Properties sold | (28,064) | (22,441) | (42,975)
Deduction: Property held-for-sale | (2,190) |  |
Deduction: Impairment due to casualty loss |  | (782) |
Balance, end of year | 837,641 | 839,058 | 835,837
Accumulated depreciation: |  |  |
Balance, beginning of year | 147,136 | 135,302 | 123,684
Addition: Depreciation | 17,694 | 17,941 | 17,534
Deduction: Impairment due to casualty loss |  | (352) |
Deduction: Accumulated depreciation related to properties sold | (3,246) | (5,755) | (5,916)
Deduction: Accumulated depreciation related to property held-for-sale | (920) |  |
Balance, end of year | 160,664 | $ 147,136 | $ 135,302
Other disclosures |  |  |
Amount by which aggregate cost of the properties is higher for federal income tax purposes | $ 17,597 |  |

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- Definition Amount of decrease to accumulated depreciation for real estate investments held-for-sale for entities with a substantial portion of business acquiring and holding investment real estate. + References No definition available. + Details
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- Definition Amount of real estate investments held-for-sale for entities with a substantial portion of business acquiring and holding investment real estate. + References No definition available. + Details
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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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- Definition Amount of other deductions to accumulated depreciation, excluding sales, 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(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of decrease to accumulated depreciation for real estate investments sold 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(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + 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 E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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