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Convertible Senior Notes Due 2023 (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Summary of liability component of 2023 Notes The liability component of the 2023 Notes consists of the following, (dollars in thousands):
March 31,
2022		December 31,
2021
(unaudited) 
2023 Notes$402,500 $402,500 
Unamortized debt discount and deferred financing costs(2,118)(23,248)
Total carrying value$400,382 $379,252