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Fair Values - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net $ 801,707 $ 827,861
Debt obligations, net 3,283,062 3,387,080
Fair Value    
Book and estimated fair values of financial instruments    
Loans receivable and other lending investments, net 800,000 900,000
Debt obligations, net $ 3,300,000 $ 3,600,000