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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION - Activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward] |  |  |
Balance at beginning of period | $ 7,278,608,000 | $ 7,621,930,000 | $ 7,947,647,000
Additions and improvements | 129,923,000 | 144,256,000 | 177,482,000
Acquisitions of real estate assets | 5,700,000 | 3,301,000 | 78,516,000
Disposals, deconsolidations and accumulated depreciation on impairments | (786,889,000) | (305,813,000) | (506,399,000)
Transfers to (from) real estate assets | 22,573,000 | (11,531,000) | (3,915,000)
Impairment of real estate assets | (238,515,000) | (173,535,000) | (71,401,000)
Balance at end of period | 6,411,400,000 | 7,278,608,000 | 7,621,930,000
Accumulated depreciation, beginning of period | 2,493,082,000 | 2,465,095,000 | 2,427,108,000
Depreciation expense | 241,631,000 | 261,838,000 | 272,945,000
Accumulated depreciation on real estate assets sold, retired, deconsolidated or impaired | (385,309,000) | (233,851,000) | (234,958,000)
Accumulated depreciation, end of period | $ 2,349,404,000 | $ 2,493,082,000 | $ 2,465,095,000

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- Definition Real Estate Assets, Impairment of Real Estate Assets + References No definition available. + Details
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- Definition Real Estate, Disposals and Deconsolidations + References No definition available. + Details
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- Definition Real Estate Transfers To From Real Estate Assets. + References No definition available. + Details
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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=6590653&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=6590653&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=6590653&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=6590653&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=6590653&loc=d3e638233-123024 + Details
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