Fair Value Measurements Schedule of Fair Value of Liabilities (Details) - USD ($)
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3 Months Ended |
12 Months Ended |
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May 22, 2020 |
Mar. 15, 2019 |
Dec. 31, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Nov. 30, 2017 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term debt, net |
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$ 1,068,624,000
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$ 1,068,624,000
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$ 1,057,389,000
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| Proved Property [Member] | Minimum |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Percentage of Undiscounted cash flows exceeding carrying values |
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30.00%
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| Proved Property [Member] | Maximum |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Percentage of Undiscounted cash flows exceeding carrying values |
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100.00%
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| Proved Property [Member] | Fair Value, Nonrecurring [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Property, Plant, and Equipment, Fair Value Disclosure |
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$ 179,600,000
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$ 179,600,000
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771,400,000
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| Asset Impairment Charges |
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591,800,000
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| Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term debt, net |
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738,624,000
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738,624,000
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882,389,000
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| Senior Notes Due 2026 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of senior notes |
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206,955,000
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206,955,000
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394,480,000
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| Long-term debt |
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289,448,000
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289,448,000
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400,000,000
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$ 400,000,000.0
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| Senior Notes Due 2027 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of senior notes |
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254,791,000
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254,791,000
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520,000,000
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| Long-term debt |
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$ 500,000,000.0
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356,351,000
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356,351,000
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500,000,000
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| Debt Instrument, Issued Price, Percentage |
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99.235%
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| Senior Secured Note due 2025 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of senior notes |
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114,366,000
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114,366,000
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0
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| Long-term debt |
$ 127,100,000
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127,073,000
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127,073,000
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0
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| Debt Instrument, Issued Price, Percentage |
83.44%
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| Carrying Value | Senior Notes Due 2026 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term debt, net |
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284,867,000
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284,867,000
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392,623,000
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| Carrying Value | Senior Notes Due 2027 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term debt, net |
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349,856,000
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349,856,000
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489,766,000
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| Carrying Value | Senior Secured Note due 2025 | Senior Notes |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term debt, net |
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103,902,000
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103,902,000
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0
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| Revolving Credit Facility | Line of Credit |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of senior notes |
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330,000,000
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330,000,000
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175,000,000
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| Long-term Debt, Gross |
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330,000,000
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330,000,000
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175,000,000
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| Long-term debt |
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330,000,000
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330,000,000
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175,000,000
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| Revolving Credit Facility | Carrying Value | Line of Credit |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Long-term Debt, Gross |
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$ 330,000,000
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$ 330,000,000
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$ 175,000,000
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