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Convertible Notes (Schedule of Notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 17, 2017 | Aug. 16, 2013
--- | --- | --- | --- | ---
Debt instrument |  |  |  |
Total long-term convertible notes | $ 156,031 | $ 148,788 |  |
Convertible senior notes | 1.375% convertible notes due 2023 |  |  |  |
Debt instrument |  |  |  |
Face value | 172,500 | 172,500 | $ 172,500 |
Unamortized discount | (15,420) | (22,163) |  |
Unamortized Debt Issuance Expense | (1,049) | (1,549) |  |
Total convertible notes | 156,031 | 148,788 |  |
Less current portion | 0 | 0 |  |
Total long-term convertible notes | $ 156,031 | $ 148,788 |  |
Convertible senior notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |
Debt instrument |  |  |  |
Face value |  |  |  | $ 138,000

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