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Convertible Senior Notes - Due 2022 - Other (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
May 19, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 27, 2017
Convertible Senior Notes          
Loss on extinguishment of debt   $ 9,077 $ 0 $ 0  
2022 Notes          
Convertible Senior Notes          
Principal amount of debt exchanged for shares of the Company's common stock in private placement transactions $ 228,200        
Payment of cash for repurchase of convertible debt $ 231,100        
Shares issued for exchange of debt 3.9        
Loss on extinguishment of debt $ 7,800        
Face amount   $ 46,762 $ 274,995   $ 275,000