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Convertible Senior Notes - Narrative (Details) - Convertible debt - 3.00% Convertible senior notes due 2022 | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) item $ / shares | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Long-term debt |  |  |
Debt principal amount | $ 150,000,000.0 | $ 150,000,000 | $ 150,000,000
Interest rate | 3.00% |  |
Net proceeds from issuance of convertible notes | $ 145,400,000 |  |
Trading days, number | item | 20 |  |
Consecutive trading days, period | 30 days |  |
Stock price trigger (as a percent) | 130.00% |  |
Business days, period | 5 days |  |
Consecutive trading-day period | 5 days |  |
Common stock per principal amount | $ 1,000 |  |
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day (as a percent) | 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% |  |
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 (as a percent) | 25.00% |  |
Term of the convertible notes | 7 years |  |
Net deferred tax liability in connection with convertible notes | $ 22,300,000 |  |
Fair value of convertible notes |  | $ 89,200,000 |
Remaining contractual life of the convertible notes |  | 5 years 10 months 24 days |
Redemption on or after August 20, 2018 |  |  |
Long-term debt |  |  |
Trading days, number | item | 19 |  |
Consecutive trading days, period | 30 days |  |
Stock price trigger (as a percent) | 130.00% |  |
Redemption price (as a percent) | 100.00% |  |
Sinking fund | $ 0 |  |

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