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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
May 31, 2020
May 29, 2020
May 18, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2018
Convertible Senior Notes              
Net carrying amount $ 142,704       $ 110,246    
3.75% Convertible Senior Notes              
Convertible Senior Notes              
Principal amount 212,463   $ 12,500 $ 200,000      
Unamortized debt discount (133,321)            
Unamortized debt issuance costs (2,517)            
Net carrying amount 76,625            
Carrying amount of the equity component 130,249     130,300      
7.5% Convertible Senior Note              
Convertible Senior Notes              
Principal amount 48,000 $ 100,000     48,000 $ 40,000  
Unamortized debt discount (6,200)       (7,400)    
Unamortized debt issuance costs (812)       (969)    
Net carrying amount 40,988       39,631    
5.5% Convertible Senior Notes              
Convertible Senior Notes              
Principal amount 33,660 1,000   $ 100,000 100,000   $ 100,000
Unamortized debt discount (8,126)       (27,818)    
Unamortized debt issuance costs (443)       (1,567)    
Net carrying amount 25,091       70,615    
Carrying amount of the equity component   $ 37,700     $ 37,702    
Income tax benefit on equity component $ 9,200