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Long-term Debt - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 12, 2011 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Apr. 15, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Private placement date | Apr. 12, 2011 |  |  |  |  |
Issuance of private placement, principal amount | $ 200,000,000.0 |  |  |  |  |
Interest rate | 8.75% | 8.75% |  | 8.75% |  |
Term of payments of interest on notes | semi-annually |  |  |  |  |
Total amount of debt to be retired |  |  |  |  |  | $ 50,000,000
Percentage of debt to be retired from the total debt |  |  |  |  |  | 25.00%
Proceeds from sale of assets, limit |  |  |  | $ 15,000,000 |  |
Interest expense on note |  | $ 3,300,000 | $ 3,300,000 | $ 6,600,000 | $ 6,600,000 |

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