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Fair Values (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 1,381,227 $ 1,450,439
Debt obligations, net 3,882,395 3,389,908
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 1,400,000 1,500,000
Debt obligations, net $ 4,200,000 $ 3,600,000