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Fair Values (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 1,637,387 $ 1,601,985
Debt obligations, net 4,110,730 4,118,823
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 1,700,000 1,600,000
Debt obligations, net $ 4,300,000 $ 4,300,000