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Schedule III-Real Estate and Accumulated Depreciation - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in total real estate assets |  |  |
Balances, beginning of year | $ 8,993,049 | $ 8,878,820 | $ 9,127,533
Additions | 419,369 | 176,690 | 246,719
Dispositions and retirements | (155,706) | (62,461) | (495,432)
Balances, end of year | 9,256,712 | 8,993,049 | 8,878,820
Aggregate gross cost of the property for federal income tax purposes | 9,178,539 |  |
Changes in accumulated depreciation |  |  |
Balances, beginning of year | 2,349,536 | 2,093,044 | 2,018,303
Additions | 287,925 | 287,846 | 275,236
Dispositions and retirements | (75,328) | (31,354) | (200,495)
Balances, end of year | $ 2,562,133 | $ 2,349,536 | $ 2,093,044
Buildings and improvements | Minimum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 5 years |  |
Buildings and improvements | Maximum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 40 years |  |
Tenant improvements | Minimum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 5 years |  |
Tenant improvements | Maximum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 7 years |  |
Equipment and furnishings | Minimum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 5 years |  |
Equipment and furnishings | Maximum |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Estimated useful lives of assets | 7 years |  |

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- Definition The amount that was removed from accumulated depreciation pertaining to real estate that was sold or retired in the period. + References No definition available. + Details
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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, 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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