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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Carrying Amount of Real Estate Investments and Accumulated Depreciation [Roll Forward] |  |  |
Balance at beginning of period | $ 7,621,930 | $ 7,947,647 | $ 8,240,521
Additions and improvements | 144,256 | 177,482 | 263,265
Acquisitions of real estate assets | 3,301 | 78,516 | 0
Disposals, deconsolidations and accumulated depreciation on impairments | (305,813) | (506,399) | (435,331)
Transfers from real estate assets | (11,531) | (3,915) | (3,986)
Impairment of real estate assets | (173,535) | (71,401) | (116,822)
Balance at end of period | 7,278,608 | 7,621,930 | 7,947,647
Accumulated depreciation, beginning of period | 2,465,095 | 2,427,108 | 2,382,568
Depreciation expense | 261,838 | 272,945 | 272,697
Accumulated depreciation on real estate assets sold, retired, deconsolidated or impaired | (233,851) | (234,958) | (228,157)
Accumulated depreciation, end of period | $ 2,493,082 | $ 2,465,095 | $ 2,427,108

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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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