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Supplemental Guarantor Condensed Consolidated Financial Statements - Additional Information (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 23, 2017 | Apr. 12, 2011
Interest owned by the holding company | 100.00% |  |
6.75% Senior Secured Notes [Member] | Secured Debt [Member] |  |  |
Debt Instrument, Face Amount |  | $ 200.0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.75% |
8.75% Senior Secured Notes [Member] | Secured Debt [Member] |  |  |
Debt Instrument, Face Amount |  |  | $ 200.0
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% |

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