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Fair Values - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 808,289 $ 988,224
Debt obligations, net 3,827,359 3,609,086
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 800,000 1,000,000
Debt obligations, net $ 4,000,000 $ 3,500,000