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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance, beginning of year | $ 661,546 | $ 695,012 | $ 660,276
Depreciation expense | 113,973 | 117,216 | 132,662
Impairment | 0 | (19,226) | (2,838)
Disposals | (25,400) | (131,456) | (95,088)
Balance, end of year | $ 750,119 | $ 661,546 | $ 695,012
Building | Minimum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 20 years |  |
Building | Maximum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 35 years |  |
Building Improvements | Minimum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 10 years |  |
Building Improvements | Maximum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 35 years |  |
Furniture and Fixtures | Minimum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 5 years |  |
Furniture and Fixtures | Maximum |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Life used for depreciation | 10 years |  |

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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 Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 I)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of depreciation expense of 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(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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