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Debt - Issuance of 6.5% Senior Secured Notes due 2025 (Details) - USD ($) | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Dec. 31, 2017 | Sep. 12, 2017 | Dec. 25, 2016 | Sep. 22, 2015 | May 31, 2014 | May 14, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal |  | $ 300,800,000.0 |  | $ 437,300,000.0 |  |  |
Senior notes | 6.5% Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal | $ 300,000,000 |  |  |  |  |  |
Stated interest rate | 6.50% | 6.50% |  |  |  |  |
Debt issuance costs | $ 6,600,000 |  |  |  |  |  |
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] |  |  |  |  |  |  |
Principal |  | $ 300,000,000 |  |  |  | $ 625,000,000.0 |
Stated interest rate |  | 7.00% |  |  |  | 7.00% |
Debt issuance costs |  |  |  |  |  |  | $ 8,800,000
Reacquisition price | $ 385,200,000 |  | $ 135,500,000 |  | $ 175,000,000 |  |
Premium | 12,000,000 |  |  |  |  |  |
Accrued interest | $ 300,000 |  |  |  |  |  |

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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