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Convertible Senior Notes Due 2023 (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Summary of liability component of 2023 Notes The liability component of the 2023 Notes consists of the following (dollars in thousands):
September 30,
2021		December 31,
2020
(unaudited) 
2023 Notes$402,500 $402,500 
Unamortized debt discount and deferred financing costs(27,712)(40,749)
Total carrying value$374,788 $361,751 
Fair value (Level 2) $397,469 $383,381