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Schedule III-Real Estate and Accumulated Depreciation (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Aggregate gross cost of the property for federal income tax purposes | $ 7,343,322 | $ 7,343,322 |  |
Changes in total real estate assets |  |  |  |
Balances, beginning of year |  | 9,012,706 | 7,489,735 | 6,908,507
Additions | 943,159 |  | 1,909,530 | 784,717
Dispositions and retirements | (774,527) |  | (386,559) | (203,489)
Balances, end of year | 9,181,338 | 9,181,338 | 9,012,706 | 7,489,735
Changes in accumulated depreciation |  |  |  |
Balances, beginning of year |  | 1,533,160 | 1,410,692 | 1,234,380
Additions |  | 284,500 | 241,231 | 223,630
Dispositions and retirements |  | (258,088) | (118,763) | (47,318)
Balances, end of year | $ 1,559,572 | $ 1,559,572 | $ 1,533,160 | $ 1,410,692
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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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