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Debt Securities (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Apr. 11, 2018 | Apr. 03, 2017 | Apr. 01, 2017 | Feb. 15, 2017
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  |  |  | $ 950,000,000.0 |
6.000% Senior Secured Notes due March 2022 | Senior Notes |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Stated interest rate | 6.00% |  |  |  |  |
6.000% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 500,000,000.0
6.375% Senior Secured Notes due March 2025 | Senior Notes |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Stated interest rate | 6.375% |  |  |  |  |
6.375% Senior Secured Notes due March 2025 | Senior Notes | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 500,000,000.0
Successor Credit Agreement | Senior Secured Term Loan due 2025, net of original issue discount |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Principal amount | $ 400,000,000.0 |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  |  |  |
Floor interest rate |  |  | 1.00% |  |  |
Successor Credit Agreement | Senior Secured Term Loan due 2025, net of original issue discount | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Principal amount |  |  |  | $ 950,000,000.0 |  |
London Interbank Offered Rate (LIBOR) | Successor Credit Agreement | Senior Secured Term Loan due 2025, net of original issue discount |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |

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