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, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross $ 1,916,045 $ 1,576,214 $ 1,507,870
Real Estate, Other Acquisitions 0 304,572 0
Real Estate, Improvements 34,633 42,161 95,185
Real Estate, Impairment Charges 0 0 (846)
Real Estate, Dispositions and Assets Held for Sale (3,326) (6,902) (25,995)
Real Estate, Gross $ 1,947,352 $ 1,916,045 $ 1,576,214