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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 17,777,280 $ 11,022,248  
Total losses (realized/unrealized)      
Included in earnings 103,782 443,823  
Purchases   7,309,459  
Paydowns (236,860) (994,993)  
Sales (16,589,867)    
Charge-off   (3,257)  
Balance at the end of period 1,054,335 17,777,280 $ 11,022,248
VIE, Primary Beneficiary      
Total losses (realized/unrealized)      
Included in earnings 68,764    
Sales 22,226    
Balance at the end of period 1,054,335    
VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,052,829 0  
Total losses (realized/unrealized)      
Included in earnings   27  
Purchases   1,055,720  
Paydowns (89,484) (2,918)  
Charge-off   0  
Balance at the end of period   1,052,829 0
VIE, Primary Beneficiary | Consolidated K-Series      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 16,724,451 11,022,248 9,189,459
Total losses (realized/unrealized)      
Included in earnings 35,018 443,796 (211,738)
Purchases   6,253,739 2,182,330
Paydowns (147,376) (992,075) (137,803)
Sales (16,612,093)    
Charge-off   (3,257)  
Balance at the end of period $ 0 $ 16,724,451 $ 11,022,248