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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 17, 2017 | Aug. 16, 2013
Interest expense related to notes |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts | $ 7,243 | $ 6,854 | $ 9,243 |  |
Additional paid in capital | $ 1,270,426 | $ 1,261,142 |  |  |
Convertible senior notes | 1.375% convertible notes due 2023 |  |  |  |  |
Debt instrument |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% | 1.375% | 1.375% | 1.375% |
Convertible senior notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Debt instrument |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.125% |  | 1.125%
Convertible senior notes |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Total interest expense on convertible notes | $ 9,615 | $ 9,226 | $ 11,991 |  |
Convertible senior notes | 1.375% convertible notes due 2023 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Coupon interest | 2,372 | 2,372 | 2,372 |  |
Amortization of Debt Issuance Costs and Discounts | $ 7,243 | $ 6,854 | $ 6,486 |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.90% | 4.90% | 4.90% |  |
Debt Instrument, Face Amount | $ 172,500 | $ 172,500 |  | $ 172,500 |
Convertible senior notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Coupon interest | 0 | 0 | $ 377 |  |
Amortization of Debt Issuance Costs and Discounts | $ 0 | $ 0 | $ 2,756 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 5.50% |  |
Debt Instrument, Face Amount |  |  |  |  | $ 138,000

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