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Long-Term Debt - 7.25 Senior Notes (Details 6) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 04, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Long-Term Debt |  |  |  |
Principle amount of senior notes | $ 350,000,000.0 |  |  |
Repayments of long-term debt |  | $ 1,921,758,000 | $ 1,727,500,000 | $ 2,195,750,000
Amortization of debt discount |  | 1,170,000 | $ 12,380,000 | $ 23,407,000
7.25% senior notes due December 2018 |  |  |  |
Long-Term Debt |  |  |  |
Principle amount of senior notes | $ 350,000,000.0 |  |  |
Interest rate (as a percent) | 7.25% |  | 7.25% |
Repayments of long-term debt | $ 369,200,000 |  |  |
Call premium expense |  | 6,300,000 |  |
Amortization of debt discount |  | $ 2,900,000 |  |
7.25% senior notes due December 2018 | Twelve month period beginning December 1, 2015 |  |  |  |
Long-Term Debt |  |  |  |
Redemption price as percentage of principal amount | 101.813% |  |  |

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