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Convertible Notes (Schedule of Notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 17, 2017 | Aug. 16, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total convertible notes | $ 141,934 | $ 213,898 |  |
Less current portion | 0 | 78,451 |  |
Total long-term convertible notes | 141,934 | 135,447 |  |
Convertible notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total convertible notes | 172,500 | 253,707 |  |
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face Value | 172,500 | 172,500 | $ 172,500 |
Unamortized discount | (28,517) | (34,506) |  |
Unamortized Debt Issuance Expense | (2,049) | (2,547) |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face Value | 0 | 81,207 |  | $ 138,000
Unamortized discount | 0 | (2,547) |  |
Unamortized Debt Issuance Expense | $ 0 | $ (209) |  |

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