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Convertible Senior Notes Due 2023 (Tables)
 3 Months Ended
Mar. 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):
March 31,
2020		December 31,
2019
(unaudited) 
2023 Notes$402,500  $402,500  
Unamortized debt discount and deferred financing costs(53,268) (57,330) 
Total carrying value$349,232  $345,170