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Fair Value of Financial Instruments - Change in Level 3 - Note Hedge Warrants (Details) - Warrants
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Change in Level 3 Liabilities  
Balance at beginning of period $ (24,260)
Change in fair value, recorded as a component of (loss) gain on derivatives 11,302
Balance at end of period $ (12,958)