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Debt - Carrying Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Nov. 17, 2020
May 18, 2020
Dec. 31, 2019
Jan. 10, 2017
Debt          
Principal amount $ 389,195        
Unamortized debt discount/transaction costs (68,080)        
Net carrying value 321,115        
2023 Notes          
Debt          
Principal amount 131,695     $ 345,000 $ 345,000
Unamortized debt discount/transaction costs (11,925)     (44,932)  
Net carrying value 119,770     $ 300,068  
2025 Notes          
Debt          
Principal amount 132,500 $ 132,500      
Unamortized debt discount/transaction costs (22,097)        
Net carrying value 110,403        
2027 Notes          
Debt          
Principal amount 125,000   $ 125,000    
Unamortized debt discount/transaction costs (34,058)        
Net carrying value $ 90,942