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Real Estate and Accumulated Depreciation (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Investment in Real Estate |  |
Land | $ 654,951 |
Building & improvements | 2,432,314 |
Accumulated Depreciation | (695,931) |
Subtotal | 2,391,334 |
Construction in Progress | 27,785 |
Net Investment in Real Estate | 2,419,119 |
Total at December 31, 2011 | 91,659 | 392,291
Amounts within net investment in real estate |  |
Land, net Investment in real estate | 638,071 | 554,829
Buildings & Improvements, net Investment in real estate | 2,326,245 | 2,061,266
Less: Accumulated Depreciation | (658,729) | (509,634)
Subtotal, net Investment in real estate | 2,305,587 |
Construction in Progress, net Investment in real estate | 27,780 | 2,672
Net Investment in Real Estate | 2,333,367 | 2,109,133
Assets Held-for-sale [Member] |  |
Investment in Real Estate |  |
Land | 16,880 |
Building & improvements | 106,069 |
Accumulated Depreciation | (37,202) |
Subtotal | 85,747 |
Construction in Progress | 5 |
Net Investment in Real Estate | 85,752 |
Leasing Commissions, Net, Deferred Leasing Intangibles, Net and Deferred Rent Receivable, Net | $ 5,907 |

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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