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Convertible Notes (Schedule of Notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 17, 2017
--- | --- | --- | ---
Debt instrument |  |  |
Less current portion | $ 163,687 | $ 0 |
Total long-term convertible notes | 0 | 156,031 |
1.375% convertible notes due 2023 | Convertible senior notes |  |  |
Debt instrument |  |  |
Face value | 172,500 | 172,500 | $ 172,500
Unamortized discount | (8,266) | (15,420) |
Unamortized debt issuance costs | (547) | (1,049) |
Total convertible notes | 163,687 | 156,031 |
Less current portion | 163,687 | 0 |
Total long-term convertible notes | $ 0 | $ 156,031 |

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