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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION - Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward] |  |  |
Balance at beginning of period | $ 6,411,400 | $ 7,278,608 | $ 7,621,930
Additions and improvements | 36,337 | 129,923 | 144,256
Acquisitions of real estate assets |  | 5,700 | 3,301
Disposals, deconsolidations and accumulated depreciation on impairments | (377,165) | (786,889) | (305,813)
Transfers to (from) real estate assets | 332 | 22,573 | (11,531)
Impairment of real estate assets | (211,791) | (238,515) | (173,535)
Balance at end of period | 5,859,113 | 6,411,400 | 7,278,608
Accumulated depreciation, beginning of period | 2,349,404 | 2,493,082 | 2,465,095
Depreciation expense | 205,671 | 241,631 | 261,838
Accumulated depreciation on real estate assets sold, retired, deconsolidated or impaired | (313,654) | (385,309) | (233,851)
Accumulated depreciation, end of period | $ 2,241,421 | $ 2,349,404 | $ 2,493,082

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- Definition Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward] + 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, 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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- Definition Amount of increase in real estate investments related to improvements 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 increase in real estate investments from acquisitions other than through foreclosure 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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