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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - Asset-backed Securities, Securitized Loans and Receivables - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]        
Aggregate fair value $ 1,290,029 $ 1,290,029   $ 1,290,029
Principal amount of Securitized debt 27,000 27,000    
Outstanding amount of Senior Bonds, at carrying value 495,582 495,582   570,952
Outstanding amount of Senior Bonds, at fair value 20,520 20,520   0
Outstanding amount of Senior Bonds $ 516,100 $ 516,100   $ 571,000
Weighted average interest rate 3.79% 3.79%   3.68%
Weighted average contractual maturity of Senior Bonds   29 years 30 years  
Cash received $ 18,400 $ 821,175 $ 802,815  
Debt issuance cost 2,500 2,500   $ 2,900
Senior notes        
Variable Interest Entity [Line Items]        
Principal amount of Securitized debt 829,817 829,817   802,817
Proceeds from Senior bond sold with Step up feature   $ 451,700 $ 493,200  
Debt instrument, basis spread on variable rate   3.00%    
Debt instrument, coupon step-up period     36 months  
Senior Support Certificates        
Variable Interest Entity [Line Items]        
Principal amount of Securitized debt $ 248,174 $ 248,174   $ 275,174