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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 23, 2017 | Apr. 15, 2017 | Apr. 15, 2014 | Apr. 12, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 19, 2017
6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Private placement date | Jun. 23, 2017 |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 200.0 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75% |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 4.3 |  |  |  |  |  |  |
Debt Instrument, Issue Price Percentage | 100.00% |  |  |  |  |  |  |
Percentage of Notes Registered under the Securities Act of 1933 |  |  |  |  |  |  |  | 99.80%
Term of payments of interest on notes | semi-annually |  |  |  |  |  |  |
Interest expense on note |  |  |  |  | $ 7.0 |  |  |
8.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 200.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.75% |  |  | 8.75% | 8.75% |  |  |
Extinguishment of Debt, Amount | $ 120.0 | $ 30.0 | $ 50.0 |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% | 100.00% |  |  |  |  |  |
Debt Instrument, Issue Price Percentage |  |  |  | 100.00% |  |  |  |
Term of payments of interest on notes |  |  |  | semi-annually |  |  |  |
Interest expense on note |  |  |  |  | $ 6.7 | $ 13.1 | $ 13.1 |
Interest Paid Long Term Debt |  |  |  |  | 9.4 | $ 13.1 |  |
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 3.0 |  |  |  |  |  |  |
Third Party [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 1.3 |  |  |  |  |  |  |
Maximum [Member] | 6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Restrictive Covenants Exceptions |  |  |  |  | 20.0 |  |  |
Restrictive Covenants Exception for total Dividend Payment and other Restricted Payments |  |  |  |  | $ 10.0 |  |  |

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