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Notes Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes Payable) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Jun. 16, 2017
Debt Instrument [Line Items]      
Notes payable $ 495,528 $ 495,116  
June 2027 Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount 500,000 500,000 $ 500,000
Unamortized debt issue costs (4,218) (4,607)  
Unamortized discount $ (254) $ (277) $ (300)