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Schedule III-Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Real Estate      
Balance at January 1 $ 4,022,173 $ 3,745,539 $ 4,690,096
Improvements and additions 126,580 64,558 160,549
Acquisitions through foreclosure 269,100 502,482 773,315
Dispositions 510,504 (269,761) (1,858,817)
Impairments (34,796) (20,645) (19,604)
Balance at December 31 3,872,553 4,022,173 3,745,539
Reconciliation of Accumulated Depreciation      
Balance at January 1 (396,804) (357,420) (525,113)
Additions (69,293) (62,674) (101,621)
Dispositions (28,432) 23,290 269,314
Balance at December 31 $ (437,665) $ (396,804) $ (357,420)