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Debt - 2026 Convertible Notes (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) day | Aug. 31, 2015 USD ($) day $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Long-term debt |  |  |  |  |
Debt instrument additional mount available for repurchase |  |  |  | $ 37,500,000 |
Equity component of convertible notes, net |  |  |  | 119,482,000 |
Convertible debt | Convertible Senior Notes, 1.5%, Due September 15, 2026 |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument | $ 287,500,000 | $ 287,500,000 |  | $ 287,500,000 |
Interest rate | 1.50% | 1.50% |  | 1.50% |
Net proceeds from issuance of convertible notes |  |  |  | $ 279,300,000 |
Conversion ratio |  | 19.0404 |  |  |
Conversion price per share | $ / shares | $ 52.52 |  |  | $ 52.52 |
Equity component of convertible notes, net |  | $ 123,000,000.0 |  |  |
Net deferred tax liability in connection with convertible notes | $ 25,300,000 |  |  | $ 25,300,000 |
Term of the convertible notes | 6 years 8 months 12 days |  |  |  |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument | $ 150,000,000 |  | $ 150,000,000.0 | $ 150,000,000 | $ 150,000,000
Interest rate |  |  | 3.00% |  |
Net proceeds from issuance of convertible notes |  |  | $ 145,400,000 |  |
Consecutive trading days, period | day |  |  | 30 |  |
Stock price trigger |  | 130.00% | 130.00% |  |
Trading days, number | day |  | 20 | 20 |  |
Business days, period |  | 5 days | 5 days |  |
Consecutive trading-day period |  | 5 days | 5 days |  |
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day | 98.00% |  | 98.00% | 98.00% |
Conversion ratio |  |  | 17.7487 |  |
Conversion price per share | $ / shares |  |  | $ 56.34 |  |
Convertible instruments principal and unpaid interest payable upon events of default |  | 100.00% | 100.00% |  |
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default |  | 25.00% | 25.00% |  |
Net deferred tax liability in connection with convertible notes |  |  | $ 22,300,000 |  |
Term of the convertible notes |  |  | 7 years |  |
Convertible debt | 3.00% Convertible senior notes due 2022 | Redemption on or after August 20, 2018 |  |  |  |  |
Long-term debt |  |  |  |  |
Consecutive trading days, period | day |  | 30 | 30 |  |
Stock price trigger |  | 130.00% | 130.00% |  |
Trading days, number | day |  | 19 | 19 |  |
Redemption price |  | 100.00% | 100.00% |  |
Debt instrument, cumulative sinking fund payments | $ 0 |  |  | $ 0 |

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