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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Asset-backed Securities, Securitized Loans and Receivables        
Variable Interest Entity [Line Items]        
Aggregate fair value $ 1,681,500 $ 1,681,500   $ 1,290,029
Outstanding amount of Senior Bonds, at carrying value 448,893 448,893   570,952
Outstanding amount of Senior Bonds, at fair value 388,790 388,790   0
Outstanding amount of Senior Bonds, total 837,683 837,683   570,952
Outstanding amount of Senior Bonds $ 837,700 $ 837,700   $ 571,000
Weighted average interest rate 2.93% 2.93%   3.68%
Weighted average contractual maturity of Senior Bonds   36 years 30 years  
Cash received   $ 1,193,969 $ 802,815  
Debt issuance cost $ 2,200 2,200   $ 2,900
Senior notes        
Variable Interest Entity [Line Items]        
Cash received 372,800 399,800    
Senior notes | Asset-backed Securities, Securitized Loans and Receivables        
Variable Interest Entity [Line Items]        
Principal amount of Securitized debt 1,202,616 1,202,616   802,817
Proceeds from Senior bond sold with Step up feature   $ 743,900 $ 493,200  
Debt instrument, coupon step-up period     36 months  
Senior notes | Asset-backed Securities, Securitized Loans and Receivables | Minimum [Member]        
Variable Interest Entity [Line Items]        
Debt instrument, basis spread on variable rate   1.00%    
Senior notes | Asset-backed Securities, Securitized Loans and Receivables | Maximum [Member]        
Variable Interest Entity [Line Items]        
Debt instrument, basis spread on variable rate   3.00%    
Senior Support Certificates | Asset-backed Securities, Securitized Loans and Receivables        
Variable Interest Entity [Line Items]        
Principal amount of Securitized debt $ 266,355 $ 266,355   $ 275,174