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Long-Term Debt - Convertible Senior Notes Due 2032 (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2018 | Mar. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 04, 2018 | Nov. 01, 2016 | Jul. 31, 2016 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 479,161 |  |  |  |  |  |
Repurchase of convertible debt |  |  | 60,365 | $ 0 | $ 138,401 |  |  |  |
Loss on extinguishment of long-term debt |  |  | (1,183) | (397) | (3,540) |  |  |  |
Convertible Senior Notes Maturing March 2032 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200,000 | 0 | $ 60,115 |  |  |  |  |
Interest rate (as a percent) |  | 3.25% |  |  |  |  |  |  |
Maturity date |  | Mar. 15, 2032 |  |  |  |  |  |  |
Repurchased principal amount | $ 59,300 |  |  |  |  | $ 800 | $ 125,000 | $ 7,600 | $ 7,300
Repurchase of convertible debt | 59,500 |  |  |  |  |  |  |  |
Payments for fees | $ 200 |  |  |  |  |  |  |  |
Loss on extinguishment of long-term debt |  |  | $ (200) |  | $ (3,500) |  |  |  |

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