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Fair Value Measurements - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (121,100) $ (355,075) $ (227,985) $ (281,171)
Unrealized gain, included in derivative gain 39,059 78,840 145,944 4,936
Balance at end of period (82,041) (244,235) (82,041) (244,235)
Derivative Financial Instruments, Liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Derivative adjustment related to conversions $ 0 $ 32,000 $ 0 $ 32,000