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Debt - Issuance of 6.5% Senior Secured Notes due 2025 (Details) - USD ($) | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Jul. 01, 2018 | Dec. 31, 2017 | Mar. 26, 2017 | Dec. 25, 2016 | May 31, 2014 | May 14, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal |  | $ 300,300,000 | $ 300,800,000 |  |  |  |
Debt outstanding |  | 294,100,000 | $ 294,300,000 |  |  |  |
Senior notes | 6.5% Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 6.50% |  |  |  |  |  |
Principal | $ 300,000,000 |  |  |  |  |  |
Debt issuance costs | $ 6,600,000 |  |  |  |  |  |
Debt outstanding |  | $ 300,000,000 |  |  |  |  |
Senior notes | 6.5% Notes | On or after November 30, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption percentage | 40.00% |  |  |  |  |  |
Percentage of principal amount | 100.00% |  |  |  |  |  |
Senior notes | 6.5% Notes | On or prior to November 30, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption percentage | 10.00% |  |  |  |  |  |
Percentage of principal amount | 103.00% |  |  |  |  |  |
Senior notes | 7% Senior Notes due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 7.00% |  |  |  |  |
Principal |  |  |  |  |  | $ 625,000,000.0 |
Debt issuance costs |  |  |  |  |  |  | $ 8,800,000
Reacquisition price | $ 385,200,000 |  |  | $ 62,700,000 | $ 14,500,000 |  |
Premium | 12,000,000 |  |  |  |  |  |
Accrued interest | $ 300,000 |  |  |  |  |  |

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