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Debt - Convertible Debt (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2011 USD ($) $ / shares | Jun. 30, 2011 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares
Convertible notes payable |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  |  | $ 316,300,000
Initial conversion rate (in shares per $1,000 of principal) |  | 34.1006 |
Conversion rate per value of notes |  |  | $ 1,000
Equivalent initial conversion price (in dollars per share) | $ / shares | $ 29.325 | $ 29.325 |
Number of trading days for pricing |  |  | 20 days
Number of consecutive trading days |  |  | 30 days
Percentage minimum of applicable conversion price (in hundredths) |  |  | 130.00%
Number of consecutive trading days less than 98% of test period |  |  | 5 days
Applicable percentage rate for five day consecutive trading days (in hundredths) |  |  | 98.00%
Imputed interest rate | 7.50% | 7.50% |
Expected life of convertible debt |  | 7 years |
Net cost of hedging transaction | $ 31,900,000 | $ 31,900,000 |
Convertible notes payable | Convertible Senior Notes Due June 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 316,300,000 | $ 316,300,000 |
Interest rate | 2.75% | 2.75% |
Current portion of convertible debt |  |  | $ 309,900,000
Proceeds from debt financing | $ 308,200,000 |  |
Warrants |  |  |
Debt Instrument [Line Items] |  |  |
Number of shares of common stock covered by hedging transactions | shares |  |  | 10,784,315
Number of warrants to acquire common stock | shares |  |  | 10,784,315
Strike price of warrants (in dollars per share) | $ / shares |  |  | $ 40.25

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