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Supplemental Guarantor Financial Information (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
7.25% senior notes due December 2018 |  |
Long-Term Debt |  |
Aggregate principal amount | $ 350.0 |
Interest rate (as a percent) | 7.25% | 7.25%
Guarantor Subsidiaries |  |
Long-Term Debt |  |
Ownership interest (as a percent) | 100.00% |

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