Debt - 8.50% Senior Notes due 2019 (Details) - USD ($) |
12 Months Ended | ||||
|---|---|---|---|---|---|
May 18, 2017 |
Dec. 31, 2017 |
Jul. 01, 2017 |
Dec. 31, 2016 |
Jun. 30, 2014 |
|
| Debt | |||||
| Loss on extinguishment of debt | $ 9,848,000 | ||||
| 8.5% Senior Notes Due 2019 | |||||
| Debt | |||||
| Stated interest rate (percent) | 8.50% | 8.50% | |||
| Aggregate principal amount | $ 200,000,000 | ||||
| Amount of debt repurchased | $ 45,500,000 | $ 154,500,000 | |||
| Percentage of debt repurchased | 23.00% | ||||
| Purchase price of debt | $ 1,038.87 | ||||
| Early tender purchase price of debt | $ 6.99 | ||||
| Loss on extinguishment of debt | 9,800,000 | ||||
| Redemption premium | $ 4,900,000 | ||||
| 6.625% Senior Notes Due 2022 | |||||
| Debt | |||||
| Stated interest rate (percent) | 6.625% | ||||
| Aggregate principal amount | $ 400,000,000 | ||||
| Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Percentage | 100.00% | ||||
| Senior Notes | 8.5% Senior Notes Due 2019 | |||||
| Debt | |||||
| Stated interest rate (percent) | 6.625% | 8.50% | |||
| Aggregate principal amount | $ 200,000,000 | ||||
| Senior Notes | 8.5% Senior Notes Due 2019 | Subsidiary guarantors | |||||
| Debt | |||||
| Parent ownership percentage (percent) | 100.00% |