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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real Estate and Equipment |  |  |
Balance at the end of the period | $ 7,523,787 |  |
Accumulated Depreciation |  |  |
Balance at the end of the period | 1,703,187 |  |
Continuing Operations |  |  |
Real Estate and Equipment |  |  |
Balance at the beginning of the period | 7,461,586 | $ 7,876,300 | $ 7,824,763
Additions | 192,124 | 277,350 | 242,270
Disposals | (145,430) | (250,996) | (17,923)
Impairment | (106,972) | (114,786) | (46,797)
Cost basis adjustment | (126,127) | (77,642) | (122,711)
Reclassification of assets held for sale, net | 135,549 | (248,640) | (3,302)
Balance at the end of the period | 7,410,730 | 7,461,586 | 7,876,300
Accumulated Depreciation |  |  |
Balance at the beginning of the period | 1,570,801 | 1,534,392 | 1,454,477
Additions | 216,418 | 221,165 | 205,117
Disposals | (10,228) | (54,816) | (1,101)
Impairment | 0 | 0 | 0
Cost basis adjustment | (126,127) | (77,642) | (122,711)
Reclassification of assets held for sale, net | 44,037 | (52,298) | (1,390)
Balance at the end of the period | $ 1,694,901 | $ 1,570,801 | $ 1,534,392

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- Definition SEC Schedule III, Real Estate Accumulated Depreciation, Reclassification To (From) Of Assets Held For Sale + 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 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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