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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |
Schedule of notional amounts of outstanding derivative positions [Table Text Block] | As of March 31, 2019, the Company had commodity derivative contracts outstanding through the fourth quarter of 2022 as summarized in the tables below. Oil Swaps
Contract Period |  | NYMEX WTI Volumes |  | Weighted-Average Contract Price
|  | (MBbl) |  | (per Bbl)
Second quarter 2019 |  | 575 |  |  | $ | 55.52 |
Third quarter 2019 |  | 1,217 |  |  | $ | 61.41 |
Fourth quarter 2019 |  | 1,115 |  |  | $ | 59.97 |
2020 |  | 2,491 |  |  | $ | 65.68 |
Total |  | 5,398 |  |  |
Oil Collars
Contract Period |  | NYMEX WTI Volumes |  | Weighted-Average Floor Price |  | Weighted-Average Ceiling Price
|  | (MBbl) |  | (per Bbl) |  | (per Bbl)
Second quarter 2019 |  | 3,034 |  |  | $ | 52.39 |  |  | $ | 64.32 |
Third quarter 2019 |  | 2,547 |  |  | $ | 49.50 |  |  | $ | 62.64 |
Fourth quarter 2019 |  | 3,168 |  |  | $ | 50.54 |  |  | $ | 62.49 |
2020 |  | 3,405 |  |  | $ | 55.00 |  |  | $ | 63.00 |
Total |  | 12,154 |  |  |  |  |
Oil Basis Swaps
Contract Period |  | WTI Midland-NYMEX WTI Volumes |  | Weighted-Average Contract Price (1) |  | NYMEX WTI-ICE Brent Volumes |  | Weighted-Average Contract Price (2)
|  | (MBbl) |  | (per Bbl) |  | (MBbl) |  | (per Bbl)
Second quarter 2019 |  | 2,571 |  |  | $ | (4.49 | ) |  | — |  |  | $ | — |
Third quarter 2019 |  | 3,291 |  |  | $ | (2.86 | ) |  | — |  |  | $ | — |
Fourth quarter 2019 |  | 3,338 |  |  | $ | (2.87 | ) |  | — |  |  | $ | — |
2020 |  | 11,601 |  |  | $ | (1.03 | ) |  | 2,750 |  |  | $ | (8.03 | )
2021 |  | 3,707 |  |  | $ | 0.33 |  |  | 3,650 |  |  | $ | (7.86 | )
2022 |  | — |  |  | $ | — |  |  | 3,650 |  |  | $ | (7.78 | )
Total |  | 24,508 |  |  |  |  | 10,050 |  |  |
____________________________________________
(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).
Gas Swaps
Contract Period |  | IF HSC Volumes |  | Weighted-Average Contract Price |  | WAHA Volumes |  | Weighted-Average Contract Price
|  | (BBtu) |  | (per MMBtu) |  | (BBtu) |  | (per MMBtu)
Second quarter 2019 |  | 11,177 |  |  | $ | 2.82 |  |  | 4,546 |  |  | $ | 0.70 |
Third quarter 2019 |  | 14,102 |  |  | $ | 2.84 |  |  | 4,340 |  |  | $ | 1.30 |
Fourth quarter 2019 |  | 14,433 |  |  | $ | 2.88 |  |  | 2,962 |  |  | $ | 1.75 |
2020 |  | 9,123 |  |  | $ | 2.98 |  |  | 2,060 |  |  | $ | 2.20 |
Total (1) |  | 48,835 |  |  |  |  | 13,908 |  |  |
____________________________________________
(1) | The Company has natural gas swaps in place that settle against Inside FERC Houston Ship Channel (“IF HSC”), Inside FERC West Texas (“IF WAHA”), and Platt’s Gas Daily West Texas (“GD WAHA”). As of March 31, 2019, total volumes for gas swaps are comprised of 78 percent IF HSC, 12 percent GD Waha, and 10 percent IF Waha.
Gas Collars
Contract Period |  | IF HSC Volumes |  | Weighted-Average Floor Price |  | Weighted-Average Ceiling Price
|  | (BBtu) |  | (per MMBtu) |  | (per MMBtu)
Second quarter 2019 |  | 4,358 |  |  | $ | 2.50 |  |  | $ | 2.83 |
Third quarter 2019 |  | 5,066 |  |  | $ | 2.50 |  |  | $ | 2.83 |
Fourth quarter 2019 |  | 4,818 |  |  | $ | 2.50 |  |  | $ | 2.83 |
Total |  | 14,242 |  |  |  |  |
NGL Swaps
|  | OPIS Ethane Purity Mont Belvieu |  | OPIS Propane Mont Belvieu Non-TET |  | OPIS Normal Butane Mont Belvieu Non-TET |  | OPIS Isobutane Mont Belvieu Non-TET |  | OPIS Natural Gasoline Mont Belvieu Non-TET
Contract Period |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price
|  | (MBbl) | (per Bbl) |  | (MBbl) | (per Bbl) |  | (MBbl) | (per Bbl) |  | (MBbl) | (per Bbl) |  | (MBbl) | (per Bbl)
Second quarter 2019 |  | 877 |  | $ | 12.29 |  |  | 561 |  | $ | 31.32 |  |  | 38 |  | $ | 35.64 |  |  | 29 |  | $ | 35.70 |  |  | 49 |  | $ | 50.93 |
Third quarter 2019 |  | 907 |  | $ | 12.34 |  |  | 637 |  | $ | 31.29 |  |  | 39 |  | $ | 35.64 |  |  | 30 |  | $ | 35.70 |  |  | 50 |  | $ | 50.93 |
Fourth quarter 2019 |  | 896 |  | $ | 12.36 |  |  | 651 |  | $ | 31.64 |  |  | 39 |  | $ | 35.64 |  |  | 29 |  | $ | 35.70 |  |  | 50 |  | $ | 50.93 |
2020 |  | 711 |  | $ | 11.38 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Total |  | 3,391 |  |  |  | 1,849 |  |  |  | 116 |  |  |  | 88 |  |  |  | 149 |  |
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 March 31, 2019 |  | As of December 31, 2018
| (in thousands)
Derivative assets: |  |  |
Current assets | $ | 67,567 |  |  | $ | 175,130 |
Noncurrent assets | 27,202 |  |  | 58,499 |
Total derivative assets | $ | 94,769 |  |  | $ | 233,629 |
Derivative liabilities: |  |  |
Current liabilities | $ | 95,269 |  |  | $ | 62,853 |
Noncurrent liabilities | 13,332 |  |  | 12,496 |
Total derivative liabilities | $ | 108,601 |  |  | $ | 75,349 |
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 |  | Derivative Liabilities
| As of |  | As of
| March 31, 2019 |  | December 31, 2018 |  | March 31, 2019 |  | December 31, 2018
| (in thousands)
Gross amounts presented in the accompanying balance sheets | $ | 94,769 |  |  | $ | 233,629 |  |  | $ | (108,601 | ) |  | $ | (75,349 | )
Amounts not offset in the accompanying balance sheets | (52,882 | ) |  | (56,041 | ) |  | 52,882 |  |  | 56,041 |
Net amounts | $ | 41,887 |  |  | $ | 177,588 |  |  | $ | (55,719 | ) |  | $ | (19,308 | )
Schedule of derivative (gain) loss [Table Text Block] | The following table summarizes the components of the net derivative loss line item presented in the accompanying statements of operations:
| For the Three Months Ended March 31,
| 2019 |  | 2018
| (in thousands)
Derivative settlement (gain) loss: |  |  |
Oil contracts | $ | 1,369 |  |  | $ | 20,748 |
Gas contracts | 4,134 |  |  | (6,410 | )
NGL contracts | (534 | ) |  | 10,190 |
Total derivative settlement loss | $ | 4,969 |  |  | $ | 24,528 |
Net derivative (gain) loss: |  |  |
Oil contracts | $ | 185,797 |  |  | $ | 13,966 |
Gas contracts | (6,113 | ) |  | 9,990 |
NGL contracts | (2,603 | ) |  | (16,427 | )
Total net derivative loss | $ | 177,081 |  |  | $ | 7,529 |

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