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Long-Term Debt - 4.25 Convertible Senior Notes (Details 7) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2009 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) | Dec. 04, 2015 USD ($)
Long-Term Debt |  |  |  |  |  |
Principle amount of senior notes |  |  |  |  |  | $ 350,000,000.0
Amortization of debt discount |  |  | $ 1,170,000 | $ 12,380,000 | $ 23,407,000 |
Value of shares acquired upon exercise of call options |  |  | $ 0 | 89,407,000 | 0 |
4.25% convertible senior notes due June 2014 |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Principle amount of senior notes |  | $ 355,000,000.0 |  |  |  |
Interest rate (as a percent) |  | 4.25% |  |  |  |
Conversion rate of debt instrument (Shares per USD) |  | 0.435084 |  |  |  |
Face value rate of conversion |  | 1,000 |  |  |  |
Conversion price per common stock shares (in dollars per share) | $ / shares |  | $ 22.98 |  |  |  |
Repayment of long term debt | $ 370,000,000 |  |  |  |  |
Number of shares of common stock issued upon redemption of debt | shares | 6.8 |  |  |  |  |
Amount of unamortized discount of notes |  | $ 97,900,000 |  |  |  |
Recognized interest expense related to the contractual interest coupon |  |  |  | 6,900,000 | 15,100,000 |
Amortization of debt discount |  |  |  | $ 11,300,000 | $ 23,000,000 |
Effective interest rate (as a percent) |  | 11.67% |  |  |  |
Price per share of common stock for call options purchased (in dollars per share) | $ / shares | $ 22.98 |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares | 32.19 |  |  |  |  |
Effective conversion price (in dollars per share) | $ / shares | $ 32.19 |  |  |  |  |
Debt instrument face amount for effective conversion price | $ 325,000,000 |  |  |  |  |
Number of shares acquired upon exercise of call options | shares | 6.5 |  |  |  |  |
Value of shares acquired upon exercise of call options | $ 89,400,000 |  |  |  |  |
Trading days within which counterparties have the right to exercise warrants | 80 days |  |  |  |  |
Common shares issued pursuant to warrants exercised | shares |  |  |  | 1.6 |  |

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