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Schedule III-Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |
Aggregate gross cost of the property for federal income tax purposes | $ 7,440,059 |  |
Changes in total real estate assets |  |  |
Balances, beginning of year | 12,777,882 | $ 9,181,338 | $ 9,012,706
Additions | 392,575 | 4,042,409 | 943,159
Dispositions and retirements | (2,480,801) | (445,865) | (774,527)
Balances, end of year | 10,689,656 | 12,777,882 | 9,181,338
Changes in accumulated depreciation |  |  |
Balances, beginning of year | 1,709,992 | 1,559,572 | 1,533,160
Additions | 354,977 | 289,178 | 284,500
Dispositions and retirements | (172,225) | (138,758) | (258,088)
Balances, end of year | $ 1,892,744 | $ 1,709,992 | $ 1,559,572
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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