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Schedule III-Real Estate and Accumulated Depreciation (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2007
Changes in total real estate assets |  |  |  |
Balances, beginning of year | $ 6,908,507 | $ 6,697,259 | $ 7,355,703 | $ 7,078,802
Additions | 784,717 | 239,362 | 241,025 |
Dispositions and retirements | (203,489) | (28,114) | (899,469) |
Balances, end of year | 7,489,735 | 6,908,507 | 6,697,259 | 7,078,802
Changes in accumulated depreciation |  |  |  |
Balances, beginning of year | 1,234,380 | 1,039,320 | 984,384 |
Additions | 223,630 | 206,913 | 224,279 |
Dispositions and retirements | (47,318) | (11,853) | (169,343) |
Balances, end of year | $ 1,410,692 | $ 1,234,380 | $ 1,039,320 |
Buildings and improvements | Minimum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 5 |  |  |
Buildings and improvements | Maximum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 40 |  |  |
Tenant improvements | Minimum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 5 |  |  |
Tenant improvements | Maximum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 7 |  |  |
Equipment and furnishings | Minimum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 5 |  |  |
Equipment and furnishings | Maximum |  |  |  |
REAL ESTATE AND ACCUMULATED DEPRECIATION |  |  |  |
Estimated useful lives of assets (in years) | 7 |  |  |

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- Definition Amount of depreciation expense and other additions to accumulated depreciation for the period. + References No definition available. + Details
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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 increase to real estate investments during the period due to acquisitions, improvements and other additions made to real estate. + References No definition available. + Details
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- Definition The amount as of the balance sheet date of accumulated depreciation pertaining to real estate properties. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 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 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=6882300&loc=d3e5864-122674 + Details
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