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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
May 31, 2020
May 29, 2020
May 18, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Convertible Senior Notes                        
Net carrying amount $ 110,431 $ 85,640 $ 105,088 $ 142,889       $ 113,063 $ 107,945 $ 66,844 $ 65,025  
3.75% Convertible Senior Notes                        
Convertible Senior Notes                        
Principal amount   212,463     $ 212,463 $ 12,500 $ 200,000          
Unamortized debt discount   (124,655)                    
Unamortized debt issuance costs   (2,295)                    
Net carrying amount   85,513                    
Carrying amount of the equity component   130,249         130,300          
5.5% Convertible Senior Notes                        
Convertible Senior Notes                        
Principal amount 100,000 160         $ 100,000         $ 100,000
Unamortized debt discount (27,818) (32)                    
Unamortized debt issuance costs (1,567) (1)                    
Net carrying amount 70,615 $ 127                    
Carrying amount of the equity component 37,702       $ 37,700              
Income tax benefit on equity component $ 9,200