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Long-term Debt - Narrative (Details) - Senior Secured Notes [Member] - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 23, 2017 | Apr. 15, 2017 | Apr. 12, 2011 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Apr. 15, 2014
8.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Private placement date |  |  | Apr. 12, 2011 |  |  |  |  |
Issuance of private placement, principal amount |  |  | $ 200,000,000.0 |  |  |  |  |
Interest rate |  |  | 8.75% |  |  |  |  |
Extinguishment of Debt, Amount | $ 120,000,000 | $ 30,000,000 |  |  |  |  |  |
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 |  |  |  |  |
Total amount of debt to be retired |  |  |  |  |  |  |  | $ 50,000,000
Interest expense on note |  |  |  | $ 3,400,000 | $ 3,300,000 | $ 6,700,000 | $ 6,600,000 |
6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Private placement date | Jun. 23, 2017 |  |  |  |  |  |  |
Issuance of private placement, principal amount | $ 200,000,000.0 |  |  |  |  |  |  |
Interest rate | 6.75% |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 4,100,000 |  |  |  |  |  |  |
Debt Instrument, Issue Price Percentage | 100.00% |  |  |  |  |  |  |
Term of payments of interest on notes | semi-annually |  |  |  |  |  |  |
Interest expense on note |  |  |  | $ 300,000 |  | $ 300,000 |  |
Third Party [Member] | 6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 1,100,000 |  |  |  |  |  |  |
Oppenheimer [Member] | 6.75% Senior Secured Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 3,000,000 |  |  |  |  |  |  |

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