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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |
Schedule of notional amounts of outstanding derivative positions [Table Text Block] | As of December 31, 2021, the Company had commodity derivative contracts outstanding through the fourth quarter of 2023 as summarized in the table below.
|  | Contract Period |  |  |  |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  |  |  |  |  |  |  |
|  | 2022 |  | 2022 |  | 2022 |  | 2022 |  | 2023 |  |  |  |  |  |
Oil Derivatives (volumes in MBbl and prices in $ per Bbl): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | 2,009 |  |  | 1,953 |  |  | 1,938 |  |  | 1,923 |  |  | 1,190 |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 44.81 |  |  | $ | 44.75 |  |  | $ | 44.63 |  |  | $ | 44.58 |  |  | $ | 45.20 |  |  |  |  |  |  |
Collars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | 896 |  |  | 894 |  |  | 868 |  |  | 584 |  |  | 858 |  |  |  |  |  |  |
Weighted-Average Floor Price |  | $ | 53.54 |  |  | $ | 56.94 |  |  | $ | 61.88 |  |  | $ | 57.91 |  |  | $ | 60.00 |  |  |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | 63.73 |  |  | $ | 64.93 |  |  | $ | 66.54 |  |  | $ | 61.61 |  |  | $ | 73.09 |  |  |  |  |  |  |
Basis Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WTI Midland-NYMEX WTI Volumes |  | 2,222 |  |  | 2,374 |  |  | 2,442 |  |  | 2,462 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 1.15 |  |  | $ | 1.15 |  |  | $ | 1.15 |  |  | $ | 1.15 |  |  | $ | — |  |  |  |  |  |  |
NYMEX WTI-ICE Brent Volumes |  | 900 |  |  | 910 |  |  | 920 |  |  | 920 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | (7.78) |  |  | $ | (7.78) |  |  | $ | (7.78) |  |  | $ | (7.78) |  |  | $ | — |  |  |  |  |  |  |
|  | Contract Period |  |  |  |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  |  |  |  |  |  |  |
|  | 2022 |  | 2022 |  | 2022 |  | 2022 |  | 2023 |  |  |  |  |  |
Basis Swaps (continued) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WTI Houston MEH-NYMEX WTI Volumes |  | 271 |  |  | 349 |  |  | 335 |  |  | 374 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 1.25 |  |  | $ | 1.25 |  |  | $ | 1.25 |  |  | $ | 1.25 |  |  | $ | — |  |  |  |  |  |  |
Roll Differential Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | 2,907 |  |  | 2,841 |  |  | 2,782 |  |  | 2,748 |  |  | 1,832 |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 0.11 |  |  | $ | 0.10 |  |  | $ | 0.11 |  |  | $ | 0.10 |  |  | $ | 0.39 |  |  |  |  |  |  |
Gas Derivatives (volumes in BBtu and prices in $ per MMBtu): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IF HSC Volumes |  | 8,208 |  |  | 6,808 |  |  | 6,934 |  |  | 6,982 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 2.85 |  |  | $ | 2.34 |  |  | $ | 2.37 |  |  | $ | 2.47 |  |  | $ | — |  |  |  |  |  |  |
IF WAHA Volumes |  | 4,856 |  |  | 3,079 |  |  | 3,085 |  |  | 3,067 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 2.63 |  |  | $ | 2.09 |  |  | $ | 2.19 |  |  | $ | 2.22 |  |  | $ | — |  |  |  |  |  |  |
IF Tenn TX Z0 |  | 513 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 3.22 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |
Collars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NYMEX HH Volumes |  | 859 |  |  | 1,270 |  |  | 760 |  |  | 1,908 |  |  | 2,601 |  |  |  |  |  |  |
Weighted-Average Floor Price |  | $ | 4.00 |  |  | $ | 3.00 |  |  | $ | 3.25 |  |  | $ | 3.50 |  |  | $ | 3.00 |  |  |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | 8.02 |  |  | $ | 4.48 |  |  | $ | 5.45 |  |  | $ | 4.44 |  |  | $ | 8.76 |  |  |  |  |  |  |
IF HSC Volumes |  | — |  |  | — |  |  | — |  |  | — |  |  | 900 |  |  |  |  |  |  |
Weighted-Average Floor Price |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3.38 |  |  |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7.75 |  |  |  |  |  |  |
Basis Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IF Tenn TX Z0-NYMEX HH Volumes |  | 859 |  |  | 1,270 |  |  | 760 |  |  | — |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 0.12 |  |  | $ | (0.14) |  |  | $ | (0.14) |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |
IF WAHA-NYMEX HH |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,849 |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (0.48) |  |  |  |  |  |  |
NGL Derivatives (volumes in MBbl and prices in $ per Bbl): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPIS Propane Mont Belvieu Non-TET Volumes |  | 351 |  |  | 116 |  |  | 55 |  |  | 58 |  |  | — |  |  |  |  |  |  |
Weighted-Average Contract Price |  | $ | 28.67 |  |  | $ | 33.03 |  |  | $ | 29.44 |  |  | $ | 29.63 |  |  | $ | — |  |  |  |  |  |  |
Collars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPIS Propane Mont Belvieu Non-TET Volumes |  | 180 |  |  | 253 |  |  | 164 |  |  | 173 |  |  | — |  |  |  |  |  |  |
Weighted-Average Floor Price |  | $ | 28.68 |  |  | $ | 25.94 |  |  | $ | 24.09 |  |  | $ | 24.11 |  |  | $ | — |  |  |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | 38.25 |  |  | $ | 31.69 |  |  | $ | 27.84 |  |  | $ | 28.13 |  |  | $ | — |  |  |  |  |  |  |
Schedule of fair value of derivatives in accompanying balance sheets [Table Text Block] | The following table details the fair value of commodity derivative contracts recorded in the accompanying balance sheets, by category:
| As of December 31, 2021 |  | As of December 31, 2020
| (in thousands)
Derivative assets: |  |  |
Current assets | $ | 24,095 |  |  | $ | 31,203 |
Noncurrent assets | 239 |  |  | 23,150 |
Total derivative assets | $ | 24,334 |  |  | $ | 54,353 |
Derivative liabilities: |  |  |
Current liabilities | $ | 319,506 |  |  | $ | 200,189 |
Noncurrent liabilities | 25,696 |  |  | 22,331 |
Total derivative liabilities | $ | 345,202 |  |  | $ | 222,520 |
Schedule of the potential effects of master netting arrangements [Table Text Block] | The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company’s commodity derivative contracts:
|  | Derivative Assets as of |  | Derivative Liabilities as of
|  | December 31, 2021 |  | December 31, 2020 |  | December 31, 2021 |  | December 31, 2020
|  | (in thousands)
Gross amounts presented in the accompanying balance sheets |  | $ | 24,334 |  |  | $ | 54,353 |  |  | $ | (345,202) |  |  | $ | (222,520) |
Amounts not offset in the accompanying balance sheets |  | (22,862) |  |  | (53,598) |  |  | 22,862 |  |  | 53,598 |
Net amounts |  | $ | 1,472 |  |  | $ | 755 |  |  | $ | (322,340) |  |  | $ | (168,922) |
Schedule of the components of the derivative settlement (gain) loss and the net derivative (gain) loss [Table Text Block] |
| For the Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Derivative settlement (gain) loss: |  |  |  |  |
Oil contracts | $ | 523,245 |  |  | $ | (331,559) |  |  | $ | 19,685 |
Gas contracts | 152,361 |  |  | (11,898) |  |  | (23,008) |
NGL contracts | 73,352 |  |  | (7,804) |  |  | (35,899) |
Total derivative settlement (gain) loss: | $ | 748,958 |  |  | $ | (351,261) |  |  | $ | (39,222) |
Net derivative (gain) loss: |  |  |  |  |
Oil contracts | $ | 650,959 |  |  | $ | (205,180) |  |  | $ | 172,055 |
Gas contracts | 172,248 |  |  | 30,038 |  |  | (41,205) |
NGL contracts | 78,452 |  |  | 13,566 |  |  | (33,311) |
Total net derivative (gain) loss: | $ | 901,659 |  |  | $ | (161,576) |  |  | $ | 97,539 |

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