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Convertible Senior Notes Due 2023 (Tables)
 9 Months Ended
Sep. 30, 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):
September 30,
2020		December 31,
2019
(unaudited) 
2023 Notes$402,500 $402,500 
Unamortized debt discount and deferred financing costs(44,979)(57,330)
Total carrying value$357,521 $345,170