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Fair Values (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 1,568,439 $ 1,601,985
Debt obligations, net 3,770,643 4,118,823
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 1,600,000 1,600,000
Debt obligations, net $ 3,900,000 $ 4,300,000