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Convertible Senior Notes (Schedule of Interest Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Convertible Senior Notes [Abstract]        
Contractual interest expense $ 3,375 $ 3,375 $ 6,750 $ 5,063
Amortization of debt issuance costs 154 151 307 227
Total interest expense $ 3,529 $ 3,526 $ 7,057 $ 5,290