Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation of Real Estate Property (Details)

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Schedule III - Reconciliation of Real Estate Property (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,916,045 $ 1,576,214 $ 1,507,870 $ 1,399,755
Real Estate, Other Acquisitions 304,572 0 80,733  
Real Estate, Improvements 42,161 95,185 45,055  
Real Estate, Impairment Charges 0 (846) (14,869)  
Real Estate, Dispositions and Assets Held for Sale $ (6,902) $ (25,995) $ (2,804)