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Debt - 2015 Convertible Notes (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) day $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Long-term debt |  |  |
Additional paid-in capital |  | $ 966,534,000 | $ 856,142,000
3.00% Convertible senior notes due 2022 | Convertible debt |  |  |
Long-term debt |  |  |
Debt instrument | $ 150,000,000 | 150,000,000 | 150,000,000
Interest rate | 3.00% |  |
Net proceeds from issuance of convertible notes | $ 145,400,000 |  |
Trading days, number | day | 20 |  |
Consecutive trading days, period | day | 30 |  |
Stock price trigger | 130.00% |  |
Business days, period | 5 days |  |
Consecutive trading-day period | 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% |  |
Conversion ratio | 0.0177 |  |
Conversion price per share | $ / shares | $ 56.34 |  |
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% |  |
Convertible instruments principal and unpaid interest payable upon events of default | 100.00% |  |
Term of the convertible notes | 7 years |  |
Additional paid-in capital |  | 57,500,000 |
Net deferred tax liability in connection with convertible notes | $ 22,300,000 |  |
Debt instrument |  | $ 115,700,000 | $ 85,200,000
Remaining amortization period |  | 4 years 7 months 13 days |
3.00% Convertible senior notes due 2022 | Convertible debt | Redemption on or after August 20, 2018 |  |  |
Long-term debt |  |  |
Trading days, number | day | 19 |  |
Consecutive trading days, period | day | 30 |  |
Stock price trigger | 130.00% |  |
Redemption price | 100.00% |  |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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