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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate and Equipment |  |  |
Balance at the beginning of the period | $ 7,824,763 | $ 7,617,547 | $ 7,456,940
Additions | 242,270 | 226,105 | 317,392
Disposals | (17,923) | (18,889) | (43,809)
Impairment | (46,797) |  |
Cost basis adjustment | (122,711) |  |
Reclassification of assets held for sale | (3,302) |  | (112,976)
Balance at the end of the period | 7,876,300 | 7,824,763 | 7,617,547
Accumulated Depreciation |  |  |
Balance at the beginning of the period | 1,454,477 | 1,270,716 | 1,147,540
Additions | 205,117 | 193,697 | 188,445
Disposals | (1,101) | (9,936) | (7,974)
Impairment | 0 |  |
Cost basis adjustment | (122,711) |  |
Reclassification of assets held for sale | (1,390) |  | (57,295)
Balance at the end of the period | $ 1,534,392 | $ 1,454,477 | $ 1,270,716

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- Definition Represents the amount of additions to accumulated depreciation for the period. + References No definition available. + Details
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- Definition SEC Schedule III, Real Estate Accumulated Depreciation, Reclassification Of Assets Held For Sale + References No definition available. + Details
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- Definition Represents the amount of increase in real estate investments during the period. + 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 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=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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