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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |
Schedule of notional amounts of outstanding derivative positions [Table Text Block] | As of June 30, 2021, the Company had commodity derivative contracts outstanding through the fourth quarter of 2023 as summarized in the tables below.
|  | Contract Period |  |  |  |
|  | Q3 2021 |  | Q4 2021 |  | 2022 |  | 2023 |  |  |  |
Oil Derivatives (volumes in MBbl and prices in $ per Bbl): |  |  |  |  |  |  |  |  |  |  |  |
Swaps |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | 5,363 |  |  | 4,744 |  |  | 7,823 |  |  | 1,190 |  |  |  |  |
Weighted-Average Contract Price |  | $ | 41.16 |  |  | $ | 39.85 |  |  | $ | 44.69 |  |  | $ | 45.20 |  |  |  |  |
Collars |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | — |  |  | — |  |  | 1,721 |  |  | — |  |  |  |  |
Weighted-Average Floor Price |  | $ | — |  |  | $ | — |  |  | $ | 51.84 |  |  | $ | — |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | — |  |  | $ | — |  |  | $ | 58.37 |  |  | $ | — |  |  |  |  |
Basis Swaps |  |  |  |  |  |  |  |  |  |  |  |
WTI Midland-NYMEX WTI Volumes |  | 3,756 |  |  | 3,824 |  |  | 9,500 |  |  | — |  |  |  |  |
Weighted-Average Contract Price (1) |  | $ | 0.75 |  |  | $ | 0.71 |  |  | $ | 1.15 |  |  | $ | — |  |  |  |  |
NYMEX WTI-ICE Brent Volumes |  | 920 |  |  | 920 |  |  | 3,650 |  |  | — |  |  |  |  |
Weighted-Average Contract Price (2) |  | $ | (7.86) |  |  | $ | (7.86) |  |  | $ | (7.78) |  |  | $ | — |  |  |  |  |
WTI Houston MEH-NYMEX WTI Volumes |  | 356 |  |  | 466 |  |  | 1,329 |  |  | — |  |  |  |  |
Weighted-Average Contract Price (3) |  | $ | 0.60 |  |  | $ | 0.60 |  |  | $ | 1.25 |  |  | $ | — |  |  |  |  |
Roll Differential Swaps |  |  |  |  |  |  |  |  |  |  |  |
NYMEX WTI Volumes |  | 4,326 |  |  | 3,831 |  |  | 11,278 |  |  | 1,832 |  |  |  |  |
Weighted-Average Contract Price |  | $ | (0.18) |  |  | $ | (0.16) |  |  | $ | 0.11 |  |  | $ | 0.39 |  |  |  |  |
Gas Derivatives (volumes in BBtu and prices in $ per MMBtu): |  |  |  |  |  |  |  |  |  |  |  |
Swaps (4) |  |  |  |  |  |  |  |  |  |  |  |
IF HSC Volumes |  | 12,575 |  |  | 12,412 |  |  | 28,932 |  |  | — |  |  |  |  |
Weighted-Average Contract Price |  | $ | 2.40 |  |  | $ | 2.41 |  |  | $ | 2.52 |  |  | $ | — |  |  |  |  |
WAHA Volumes |  | 8,086 |  |  | 7,627 |  |  | 14,087 |  |  | — |  |  |  |  |
Weighted-Average Contract Price |  | $ | 1.88 |  |  | $ | 1.82 |  |  | $ | 2.32 |  |  | $ | — |  |  |  |  |
IF Tenn TX Z0 |  | — |  |  | — |  |  | 513 |  |  | — |  |  |  |  |
Weighted-Average Contract Price |  | $ | — |  |  | $ | — |  |  | $ | 3.22 |  |  | $ | — |  |  |  |  |
NGL Derivatives (volumes in MBbl and prices in $ per Bbl): |  |  |  |  |  |  |  |  |  |  |  |
Swaps |  |  |  |  |  |  |  |  |  |  |  |
OPIS Propane Mont Belvieu Non-TET Volumes |  | 854 |  |  | 824 |  |  | 461 |  |  | — |  |  |  |  |
Weighted-Average Contract Price |  | $ | 22.16 |  |  | $ | 22.15 |  |  | $ | 27.19 |  |  | $ | — |  |  |  |  |
OPIS Normal Butane Mont Belvieu Non-TET Volumes |  | 37 |  |  | 36 |  |  | — |  |  | — |  |  |  |  |
Weighted-Average Contract Price |  | $ | 30.87 |  |  | $ | 30.87 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Collars |  |  |  |  |  |  |  |  |  |  |  |
OPIS Propane Mont Belvieu Non-TET Volumes |  | — |  |  | — |  |  | 627 |  |  | — |  |  |  |  |
Weighted-Average Floor Price |  | $ | — |  |  | $ | — |  |  | $ | 23.83 |  |  | $ | — |  |  |  |  |
Weighted-Average Ceiling Price |  | $ | — |  |  | $ | — |  |  | $ | 29.19 |  |  | $ | — |  |  |  |  |
____________________________________________ (1) Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma). (2) Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea). (3) Represents the price differential between Argus WTI Houston MEH (Houston, Texas) and NYMEX WTI (Cushing, Oklahoma). (4) The Company has natural gas swaps in place that settle against Inside FERC Houston Ship Channel (“IF HSC”), Inside FERC West Texas, and Platt’s Gas Daily West Texas (“IF WAHA” and “GD WAHA”, respectively, and together “WAHA”), and Inside FERC Tennessee Texas, Zone 0 (“IF Tenn TX Z0”). As of June 30, 2021, WAHA volumes were comprised of 70 percent IF WAHA and 30 percent GD WAHA.
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 June 30, 2021 |  | As of December 31, 2020
| (in thousands)
Derivative assets: |  |  |
Current assets | $ | 31,303 |  |  | $ | 31,203 |
Noncurrent assets | 13,534 |  |  | 23,150 |
Total derivative assets | $ | 44,837 |  |  | $ | 54,353 |
Derivative liabilities: |  |  |
Current liabilities | $ | 545,062 |  |  | $ | 200,189 |
Noncurrent liabilities | 116,273 |  |  | 22,331 |
Total derivative liabilities | $ | 661,335 |  |  | $ | 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
| June 30, 2021 |  | December 31, 2020 |  | June 30, 2021 |  | December 31, 2020
| (in thousands)
Gross amounts presented in the accompanying balance sheets | $ | 44,837 |  |  | $ | 54,353 |  |  | $ | (661,335) |  |  | $ | (222,520) |
Amounts not offset in the accompanying balance sheets | (44,370) |  |  | (53,598) |  |  | 44,370 |  |  | 53,598 |
Net amounts | $ | 467 |  |  | $ | 755 |  |  | $ | (616,965) |  |  | $ | (168,922) |
Schedule of the components of the derivative settlement (gain) loss and of the net derivative (gain) loss [Table Text Block] | The following table summarizes the commodity components of the derivative settlement (gain) loss, as well as the components of the net derivative (gain) loss line item presented in the accompanying statements of operations:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in thousands)
Derivative settlement (gain) loss: |  |  |  |  |  |  |
Oil contracts | $ | 134,298 |  |  | $ | (138,606) |  |  | $ | 190,627 |  |  | $ | (192,188) |
Gas contracts | 12,232 |  |  | (1,054) |  |  | 52,680 |  |  | (15,679) |
NGL contracts | 12,292 |  |  | (2,868) |  |  | 23,400 |  |  | (8,098) |
Total net derivative settlement (gain) loss | $ | 158,822 |  |  | $ | (142,528) |  |  | $ | 266,707 |  |  | $ | (215,965) |
Net derivative (gain) loss: |  |  |  |  |  |  |
Oil contracts | $ | 277,215 |  |  | $ | 151,250 |  |  | $ | 543,030 |  |  | $ | (391,290) |
Gas contracts | 61,364 |  |  | 8,261 |  |  | 110,286 |  |  | 14,989 |
NGL contracts | 31,769 |  |  | 7,689 |  |  | 61,721 |  |  | (1,839) |
Total net derivative (gain) loss | $ | 370,348 |  |  | $ | 167,200 |  |  | $ | 715,037 |  |  | $ | (378,140) |

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