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Fair Value of Financial Instruments (Level 3 Liabilities) (Details) - Level 3 - Recurring basis - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Agreements with Non-mark-to-market Collateral Provisions      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 1,159,213    
Issuances 0    
Payment of principal (117,695)    
Changes in unrealized losses (235)    
Balance at end of period 1,159,213 $ 1,041,283  
Agreements with Mark-to-market Collateral Provisions      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,124,162    
Issuances 91,997    
Payment of principal (236,618)    
Changes in unrealized losses 0    
Balance at end of period $ 1,124,162   $ 979,541