Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation of Accumulated Depreciation (Details)

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Schedule III - Reconciliation of Accumulated Depreciation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation $ 453,145 $ 412,530 $ 359,301
Real Estate Accumulated Depreciation, Depreciation Expense 66,242 64,543 64,922
Real Estate Accumulated Depreciation, Impairment Charge 0 0 (9,669)
Real Estate Accumulated Depreciation, Dispositions and Assets Held for Sale (6,902) (23,928) (2,024)
Real Estate Accumulated Depreciation $ 512,485 $ 453,145 $ 412,530