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Fair Value Measurements - Roll Forward of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, at beginning of period $ (30,958) $ (22,750)
Settlements 34,943 (13,299)
Acquired 0 0
Total gains (losses) included in earnings (25,147) 40,583
Balance, at end of period $ (21,162) $ 4,534