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Impairment of Real Estate (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Secured Bond Investment [Member]
     
Impairment of Real Estate      
Other than temporary impairment losses on a bond investments     $ 168
Segment, Continuing Operations [Member]
     
Impairment of Real Estate      
Impairment charges on real estate 4,262 35,946 2,955
Segment, Discontinued Operations [Member]
     
Impairment of Real Estate      
Impairment charges on real estate $ 5,707 $ 81,497 $ 50,061