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Debt - Narrative - Convertible Senior Notes (Details) (Convertible Senior Notes [Member], USD $)
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0 Months Ended | ||
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May 20, 2014
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Dec. 31, 2014
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May 20, 2014
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| Debt Instrument [Line Items] | |||
| Initial conversion rate applicable to each series | 0.0763636 | ||
| Conversion price (in dollars per share) | $ 13.10 | $ 13.10 | |
| Premium above public offering price | 22.50% | 22.50% | |
| Value of the embedded conversion premium, included in net debt (discount) | $ 56,700,000 | $ 51,500,000 | $ 56,700,000 |
| Deferred finance costs | 19,600,000 | ||
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Convertible Senior Notes Due 2019 [Member]
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| Debt Instrument [Line Items] | |||
| Aggregate principal amount of debt | 402,500,000.0 | 402,500,000.0 | |
| Weighted average stated interest rate | 2.875% | 2.875% | |
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Convertible Senior Notes Due 2021 [Member]
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| Debt Instrument [Line Items] | |||
| Aggregate principal amount of debt | $ 345,000,000.0 | $ 345,000,000.0 | |
| Weighted average stated interest rate | 3.75% | 3.75% |