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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 23, 2017 | Apr. 15, 2017 | Apr. 15, 2014 | Apr. 12, 2011 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Sep. 19, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 199,031 |  | $ 199,031 |  | $ 198,837 |
6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Private placement date | Jun. 23, 2017 |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 200,000 |  |  |  |  |  |  |  |  |
Interest rate | 6.75% |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 4,300 |  |  |  |  |  |  |  |  |
Interest expense on note |  |  |  |  | 3,400 | $ 3,400 | 10,100 | $ 3,700 |  |
Debt Instrument, Issue Price Percentage | 100.00% |  |  |  |  |  |  |  |  |
Percentage of Notes Registered under the Securities Act of 1933 |  |  |  |  |  |  |  |  |  | 99.80%
8.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Private placement date |  |  |  | Apr. 12, 2011 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 200,000 |  |  |  |  |  |
Interest rate | 8.75% |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 120,000 | $ 30,000 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |  |
Term of payments of interest on notes |  |  |  | semi-annually |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 50,000 |  |  |  |  |  |  |
Interest expense on note |  |  |  |  |  | $ 0 |  | $ 6,700 |  |
Debt Instrument, Issue Price Percentage | 100.00% |  |  |  |  |  |  |  |  |
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 3,000 |  |  |  |  |  |  |  |  |
Third Party [Member] | 6.75% Senior Secured Notes [Member] | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 1,300 |  |  |  |  |  |  |  |  |
Maximum [Member] | 6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Restrictive Covenants Exception for Dividend or Distribution Amount during fiscal year |  |  |  |  |  |  | 20,000 |  |  |
Restrictive Covenants Exception for total Dividend Payment and other Restricted Payments |  |  |  |  | $ 10,000 |  | $ 10,000 |  |  |

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