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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2017
Subsequent Event [Line Items] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | As of March 31, 2017, the Company had commodity derivative contracts outstanding as summarized in the tables below. Oil Swaps
Contract Period |  | NYMEX WTI Volumes |  | Weighted-Average Contract Price
|  | (MBbls) |  | (per Bbl)
Second quarter 2017 |  | 1,444 |  |  | $ | 46.44 |
Third quarter 2017 |  | 1,340 |  |  | $ | 46.66 |
Fourth quarter 2017 |  | 1,254 |  |  | $ | 46.35 |
Total |  | 4,038 |  |  |
Oil Collars
Contract Period |  | NYMEX WTI Volumes |  | Weighted- Average Floor Price |  | Weighted- Average Ceiling Price
|  | (MBbls) |  | (per Bbl) |  | (per Bbl)
Second quarter 2017 |  | 636 |  |  | $ | 45.00 |  |  | $ | 54.10 |
Third quarter 2017 |  | 583 |  |  | $ | 45.00 |  |  | $ | 54.05 |
Fourth quarter 2017 |  | 540 |  |  | $ | 45.00 |  |  | $ | 54.01 |
2018 |  | 3,343 |  |  | $ | 50.00 |  |  | $ | 58.55 |
2019 |  | 2,660 |  |  | $ | 50.00 |  |  | $ | 59.31 |
Total |  | 7,762 |  |  |  |  |
Oil Basis Swaps
Contract Period |  | Midland-Cushing Volumes |  | Weighted-Average Contract Price (1)
|  | (MBbls) |  | (per Bbl)
2018 |  | 2,080 |  |  | $ | (1.27 | )
2019 |  | 1,588 |  |  | $ | (1.45 | )
Total |  | 3,668 |  |  |
____________________________________________
(1) | Represents the price differential between WTI prices at Midland, Texas and WTI prices at Cushing, Oklahoma.
Natural Gas Swaps
Contract Period |  | Sold Volumes |  | Weighted-Average Contract Price |  | Purchased Volumes (1) |  | Weighted- Average Contract Price |  | Net Volumes
|  | (BBtu) |  | (per MMBtu) |  | (BBtu) |  | (per MMBtu) |  | (BBtu)
Second quarter 2017 |  | 26,205 |  |  | $ | 3.98 |  |  | — |  |  | $ | — |  |  | 26,205 |
Third quarter 2017 |  | 23,657 |  |  | $ | 4.01 |  |  | — |  |  | $ | — |  |  | 23,657 |
Fourth quarter 2017 |  | 22,001 |  |  | $ | 3.98 |  |  | — |  |  | $ | — |  |  | 22,001 |
2018 |  | 75,778 |  |  | $ | 3.54 |  |  | (30,606 | ) |  | $ | 4.27 |  |  | 45,172 |
2019 |  | 32,016 |  |  | $ | 4.02 |  |  | (24,415 | ) |  | $ | 4.34 |  |  | 7,601 |
Total (2) |  | 179,657 |  |  |  |  | (55,021 | ) |  |  |  | 124,636 |
____________________________________________
(1) | During 2016, the Company restructured certain of its gas derivative contracts by buying fixed price volumes to offset existing 2018 and 2019 fixed price swap contracts totaling 55.0 million MMBtu. The Company then entered into new 2017 fixed price swap contracts totaling 38.6 million MMBtu with a contract price of $4.43 per MMBtu. No other cash or other consideration was included as part of the restructuring.
(2) | Total net volumes of natural gas swaps are comprised of IF El Paso Permian (2%), IF HSC (95%), and IF NNG Ventura (3%).
NGL Swaps
|  | OPIS Purity Ethane 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
|  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl)
Second quarter 2017 |  | 787 |  | $ | 8.86 |  |  | 634 |  | $ | 21.90 |  |  | 182 |  | $ | 32.53 |  |  | 157 |  | $ | 33.38 |  |  | 249 |  | $ | 48.47 |
Third quarter 2017 |  | 736 |  | $ | 9.14 |  |  | 588 |  | $ | 21.91 |  |  | 163 |  | $ | 32.42 |  |  | 140 |  | $ | 33.28 |  |  | 222 |  | $ | 48.43 |
Fourth quarter 2017 |  | 692 |  | $ | 9.10 |  |  | 550 |  | $ | 21.91 |  |  | 149 |  | $ | 32.34 |  |  | 128 |  | $ | 33.23 |  |  | 203 |  | $ | 48.41 |
2018 |  | 2,434 |  | $ | 10.18 |  |  | 1,442 |  | $ | 22.86 |  |  | 138 |  | $ | 35.41 |  |  | 119 |  | $ | 35.44 |  |  | 189 |  | $ | 49.40 |
2019 |  | 2,176 |  | $ | 11.95 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2020 |  | 539 |  | $ | 11.13 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Total |  | 7,364 |  |  |  | 3,214 |  |  |  | 632 |  |  |  | 544 |  |  |  | 863 |  |
Summary of Oil, Gas, and NGL Derivative Contracts Entered Into Subsequent to March 31, 2017 Subsequent to March 31, 2017, and through April 26, 2017, the Company entered into various derivative commodity contracts as summarized in the tables below. Oil Collars
Contract Period |  | NYMEX WTI Volumes |  | Weighted- Average Floor Price |  | Weighted- Average Ceiling Price
|  | (MBbls) |  | (per Bbl) |  | (per Bbl)
Fourth quarter 2017 |  | 546 |  |  | $ | 50.00 |  |  | $ | 58.08 |
2018 |  | 1,687 |  |  | $ | 50.00 |  |  | $ | 57.12 |
2019 |  | 468 |  |  | $ | 50.00 |  |  | $ | 56.20 |
Total |  | 2,701 |  |  |  |  |
Oil Basis Swaps
Contract Period |  | Midland-Cushing Volumes |  | Weighted-Average Contract Price (1)
|  | (MBbls) |  | (per Bbl)
Third quarter 2017 |  | 566 |  |  | $ | (1.62 | )
Fourth quarter 2017 |  | 1,403 |  |  | $ | (1.55 | )
2018 |  | 3,584 |  |  | $ | (1.50 | )
2019 |  | 2,375 |  |  | $ | (1.45 | )
Total |  | 7,928 |  |  |
____________________________________________
(1) | Represents the price differential between WTI prices at Midland, Texas and WTI prices at Cushing, Oklahoma.
Natural Gas Swaps
Contract Period |  | IF HSC Volumes |  | Weighted-Average Contract Price
|  | (BBtu) |  | (per MMBtu)
2018 |  | 17,236 |  |  | $ | 2.87 |
2019 |  | 9,378 |  |  | $ | 2.88 |
Total |  | 26,614 |  |  |
NGL Swaps
|  | OPIS Purity Ethane 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
|  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl)
Second quarter 2017 |  | 105 |  | $ | 10.97 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Third quarter 2017 |  | 170 |  | $ | 10.98 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Fourth quarter 2017 |  | 274 |  | $ | 11.04 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2018 |  | 1,157 |  | $ | 12.23 |  |  | 345 |  | $ | 26.04 |  |  | 87 |  | $ | 31.71 |  |  | 69 |  | $ | 30.35 |  |  | 116 |  | $ | 47.36 |
Total |  | 1,706 |  |  |  | 345 |  |  |  | 87 |  |  |  | 69 |  |  |  | 116 |  |
Schedule of fair value of derivatives in accompanying balance sheets | The following tables detail the fair value of derivatives recorded in the accompanying balance sheets, by category:
| As of March 31, 2017
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 73,978 |  |  | Current liabilities |  | $ | 53,809 |
Commodity contracts | Noncurrent assets |  | 84,195 |  |  | Noncurrent liabilities |  | 81,306 |
Derivatives not designated as hedging instruments |  |  | $ | 158,173 |  |  |  |  | $ | 135,115 |
| As of December 31, 2016
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 54,521 |  |  | Current liabilities |  | $ | 115,464 |
Commodity contracts | Noncurrent assets |  | 67,575 |  |  | Noncurrent liabilities |  | 98,340 |
Derivatives not designated as hedging instruments |  |  | $ | 122,096 |  |  |  |  | $ | 213,804 |
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 derivative contracts:
| Derivative Assets |  | Derivative Liabilities
| As of |  | As of
Offsetting of Derivative Assets and Liabilities | March 31, 2017 |  | December 31, 2016 |  | March 31, 2017 |  | December 31, 2016
| (in thousands)
Gross amounts presented in the accompanying balance sheets | $ | 158,173 |  |  | $ | 122,096 |  |  | $ | (135,115 | ) |  | $ | (213,804 | )
Amounts not offset in the accompanying balance sheets | (88,952 | ) |  | (118,080 | ) |  | 88,952 |  |  | 118,080 |
Net amounts | $ | 69,221 |  |  | $ | 4,016 |  |  | $ | (46,163 | ) |  | $ | (95,724 | )
Schedule of derivative (gain) loss | The following table summarizes the components of the net derivative gain presented in the accompanying statements of operations:
| For the Three Months Ended March 31,
| 2017 |  | 2016
| (in thousands)
Derivative settlement (gain) loss: |  |  |
Oil contracts | $ | 9,084 |  |  | $ | (99,992 | )
Gas contracts | (17,506 | ) |  | (41,053 | )
NGL contracts | 8,415 |  |  | (5,983 | )
Total derivative settlement gain | $ | (7 | ) |  | $ | (147,028 | )
Total net derivative (gain) loss: |  |  |
Oil contracts | $ | (49,590 | ) |  | $ | (10,432 | )
Gas contracts | (44,468 | ) |  | (24,023 | )
NGL contracts | (20,716 | ) |  | 20,227 |
Total net derivative gain | $ | (114,774 | ) |  | $ | (14,228 | )

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