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Fair Values (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 1,052,872 $ 1,300,655
Debt obligations, net 3,869,576 3,476,400
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 1,100,000 1,300,000
Debt obligations, net $ 3,900,000 $ 3,700,000