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Convertible Senior Notes (Schedule of Interest Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Convertible Senior Notes [Abstract]        
Contractual interest expense $ 3,375 $ 3,375 $ 10,125 $ 8,438
Amortization of debt issuance costs 154 152 462 379
Total interest expense $ 3,529 $ 3,527 $ 10,587 $ 8,817