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Schedule III-Real Estate and Accumulated Depreciation - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in total real estate assets |  |  |
Balances, beginning of year | $ 10,689,656 | $ 12,777,882 | $ 9,181,338
Additions | 254,604 | 392,575 | 4,042,409
Dispositions and retirements | (1,735,049) | (2,480,801) | (445,865)
Balances, end of year | 9,209,211 | 10,689,656 | 12,777,882
Aggregate gross cost of the property for federal income tax purposes | 6,079,675 |  |
Changes in accumulated depreciation |  |  |
Balances, beginning of year | 1,892,744 | 1,709,992 | 1,559,572
Additions | 277,270 | 354,977 | 289,178
Dispositions and retirements | (318,113) | (172,225) | (138,758)
Balances, end of year | $ 1,851,901 | $ 1,892,744 | $ 1,709,992
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 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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