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Sales of Real Estate and Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
properties
Dec. 31, 2010
properties
Dec. 31, 2009
years
properties
Real Estate and Discontinued Operations [Abstract]      
Real estate number of properties sold (in # of properties) 17 13 18
Aggregate gross disposition price $ 124,039 $ 80,224 $ 108,475
Aggregate Gain on Sales of Properties 6,557 14,613 9,134
Debt satisfaction gains (charges), net (606) 2,924 11,471
Properties classified as held-for-sale (in # of properties) 0 2  
Total gross revenues 18,320 42,541 66,797
Pre-tax loss, including gains on sale (66,561) (30,547) (79,655)
Gross proceeds from sale leaseback transaction     4,750
Lease term (in years)     30
Properties conveyed to lenders (in # of properties)     3
Nonrecourse mortgage debt $ 20,653   $ 38,022