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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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The current amount of expenditures for a real estate project that has not yet been completed.

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