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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 15, 2014 | Apr. 12, 2011 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, proceeds from sale of Asset Limit or Repurchase offer given |  |  | $ 15,000,000 |  |
Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  |  | 8.75% |  |
Extinguishment of Debt, Amount | $ 50,000,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 25.00% |  |  |  |
Interest expense on note |  |  | $ 13,100,000 | $ 13,100,000 | $ 14,300,000
Interest paid on notes |  |  | $ 13,100,000 | $ 0 |
Private Placement | Senior Secured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Private placement date |  | Apr. 12, 2011 |  |  |
Issuance of private placement, principal amount |  | $ 200,000,000.0 |  |  |
Interest rate |  | 8.75% |  |  |
Term of payments of interest on notes |  |  | semi-annually |  |

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