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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 17, 2017
Interest expense related to notes |  |  |  |
Amortization of discount and debt issuance costs | $ 207 | $ 7,656 | $ 7,243 |
Convertible senior notes |  |  |  |
Interest expense related to notes |  |  |  |
Total interest expense on convertible notes | $ 804 | $ 10,028 | $ 9,615 |
Convertible senior notes | 1.375% Convertible senior notes due 2023 |  |  |  |
Interest expense related to notes |  |  |  |
Convertible notes, stated interest rate (as a percentage) | 1.375% | 1.375% | 1.375% | 1.375%
Coupon interest expense | $ 610 | $ 2,372 | $ 2,372 |
Amortization of discount and debt issuance costs | $ 194 | $ 7,656 | $ 7,243 |

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