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Convertible Senior Notes Due 2023 (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary of liability component of 2023 Notes
The liability component of the 2023 Notes consists of the following (dollars in thousands):
December 31,
2020		December 31,
2019
2023 Notes $402,500 $402,500 
Unamortized debt discount and deferred financing costs (40,749)(57,330)
Total carrying value $361,751 $345,170