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Long-Term Debt - Convertible Notes (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) shares | Sep. 30, 2014 shares | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2009 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |
Value of shares acquired upon exercise of call options |  |  | $ 0 | $ 89,407,000 |
4.25% convertible senior notes due June 2014 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principle amount of senior notes |  |  |  |  | $ 355,000,000.0
Interest rate (as a percent) | 4.25% |  |  |  | 4.25%
Conversion rate of debt instrument (Shares per USD) | 0.0435084 |  |  |  |
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 | 6,800,000 |  |  |  |
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 | 6,500,000 |  |  |  |
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 |  |  |  |
4.25% convertible senior notes due June 2014 | Warrant |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Common shares issued out of treasury stock | shares |  | 498,254 |  |  |

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