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REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Estimated useful lives |  |  |
Aggregate cost of total real estate for federal income tax purposes | $ 23,903,081 |  |
Changes in total real estate assets |  |  |
Balance, beginning of period | 23,962,222 | $ 23,606,872 | $ 22,342,576
Acquisitions, construction costs and improvements | 1,588,314 | 860,594 | 1,615,949
Dispositions, including impairment loss on planned dispositions | (623,231) | (505,244) | (351,653)
Balance, end of period | 24,927,305 | 23,962,222 | 23,606,872
Changes in accumulated depreciation |  |  |
Balance, beginning of period | 5,728,440 | 5,173,883 | 4,611,646
Depreciation, including discontinued operations | 758,596 | 707,331 | 661,578
Dispositions | (269,315) | (152,774) | (99,341)
Balance, end of period | $ 6,217,721 | $ 5,728,440 | $ 5,173,883
Building |  |  |
Estimated useful lives |  |  |
Estimated useful lives of assets (in years) | 30 years |  |
Improvements, upgrades and FF&E |  |  |
Estimated useful lives |  |  |
Estimated useful lives of assets (in years) | 7 years |  |

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- Definition Cost basis of real estate investments for federal income tax purposes 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 28 Reference 2: 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 6)) -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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- 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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