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Fair Values (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, net $ 1,582,656 $ 1,829,985 $ 1,829,985
Debt obligations, net 4,494,637 4,691,494  
Book Value
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, net   1,900,000  
Debt obligations, net   4,900,000  
Fair Value
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans receivable, net 1,700,000    
Debt obligations, net 4,800,000    
Letter of Intent from Borrower
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans 53,000    
Trade Offer in Market
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans 30,800    
Expected Net Proceeds in Auction
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans $ 1,000