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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions at Subsequent Date [Text Block] | These updated contracts are reflected in the following table, which summarizes the approximate gas volumes and average contract prices of contracts the Company had in place as of February 17, 2016, including derivatives contracts for settlement anytime during the first quarter of 2016 and later periods: Natural Gas Swaps
Contract Period |  | Volumes |  | Weighted- Average Contract Price |  | Purchased Volumes |  | Weighted- Average Contract Price |  | Total Volumes
|  | (MMBtu) |  | (per MMBtu) |  | (MMBtu) |  | (per MMBtu) |  | (MMBtu)
First quarter 2016 |  | 23,341,000 |  |  | $ | 3.82 |  |  | — |  |  | $ | — |  |  | 23,341,000 |
Second quarter 2016 |  | 20,780,000 |  |  | $ | 3.40 |  |  | — |  |  | $ | — |  |  | 20,780,000 |
Third quarter 2016 |  | 18,829,000 |  |  | $ | 3.38 |  |  | — |  |  | $ | — |  |  | 18,829,000 |
Fourth quarter 2016 |  | 17,236,000 |  |  | $ | 3.82 |  |  | — |  |  | $ | — |  |  | 17,236,000 |
2017 |  | 76,135,000 |  |  | $ | 4.26 |  |  | — |  |  | $ | — |  |  | 76,135,000 |
2018 |  | 30,606,000 |  |  | $ | 4.27 |  |  | (30,606,000 | ) |  | $ | 4.27 |  |  | — |
2019 |  | 24,415,000 |  |  | $ | 4.34 |  |  | (24,415,000 | ) |  | $ | 4.34 |  |  | — |
All gas swaps* |  | 211,342,000 |  |  |  |  | (55,021,000 | ) |  |  |  | 156,321,000 |
____________________________________________ *Total volumes of natural gas swaps are comprised of IF El Paso Permian (2%), IF HSC (96%), IF NGPL TXOK (1%), and IF NNG Ventura (1%).
Schedule of Notional Amounts of Outstanding Derivative Positions | The following tables summarize the approximate volumes and average contract prices of contracts the Company had in place as of December 31, 2015: Oil Swaps
Contract Period |  | NYMEX WTI Volumes |  | Weighted- Average Contract Price
|  | (Bbls) |  | (per Bbl)
First quarter 2016 |  | 1,868,000 |  |  | $ | 86.93 |
Second quarter 2016 |  | 1,752,000 |  |  | $ | 86.73 |
Third quarter 2016 |  | 1,170,000 |  |  | $ | 90.29 |
Fourth quarter 2016 |  | 780,000 |  |  | $ | 90.05 |
All oil swaps |  | 5,570,000 |  |  |
Natural Gas Swaps
Contract Period |  | Volumes |  | Weighted- Average Contract Price
|  | (MMBtu) |  | (per MMBtu)
First quarter 2016 |  | 23,341,000 |  |  | $ | 3.82 |
Second quarter 2016 |  | 20,780,000 |  |  | $ | 3.40 |
Third quarter 2016 |  | 18,829,000 |  |  | $ | 3.38 |
Fourth quarter 2016 |  | 17,236,000 |  |  | $ | 3.82 |
2017 |  | 37,528,000 |  |  | $ | 4.09 |
2018 |  | 30,606,000 |  |  | $ | 4.27 |
2019 |  | 24,415,000 |  |  | $ | 4.34 |
All gas swaps* |  | 172,735,000 |  |  |
____________________________________________ *Natural gas swaps are comprised of IF El Paso Permian (2%), IF HSC (95%), IF NGPL TXOK (1%), and IF NNG Ventura (2%). 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
Contract Period |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price |  | Volumes | Weighted-Average Contract Price
|  | (Bbls) | (per Bbl) |  | (Bbls) | (per Bbl) |  | (Bbls) | (per Bbl) |  | (Bbls) | (per Bbl)
First quarter 2016 |  | 926,000 |  | $ | 8.29 |  |  | 1,059,000 |  | $ | 19.60 |  |  | 143,000 |  | $ | 25.62 |  |  | 122,000 |  | $ | 25.87 |
Second quarter 2016 |  | 828,000 |  | $ | 8.28 |  |  | 949,000 |  | $ | 19.64 |  |  | 130,000 |  | $ | 25.62 |  |  | 111,000 |  | $ | 25.87 |
Third quarter 2016 |  | 751,000 |  | $ | 8.70 |  |  | 862,000 |  | $ | 19.03 |  |  | — |  | $ | — |  |  | — |  | $ | — |
Fourth quarter 2016 |  | 688,000 |  | $ | 8.71 |  |  | 791,000 |  | $ | 18.53 |  |  | — |  | $ | — |  |  | — |  | $ | — |
2017 |  | 2,271,000 |  | $ | 9.16 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2018 |  | 1,671,000 |  | $ | 10.65 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2019 |  | 1,200,000 |  | $ | 10.92 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2020 |  | 539,000 |  | $ | 11.13 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Total NGL swaps |  | 8,874,000 |  |  |  | 3,661,000 |  |  |  | 273,000 |  |  |  | 233,000 |  |
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 December 31, 2015
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity Contracts | Current assets |  | $ | 367,710 |  |  | Current liabilities |  | $ | 8 |
Commodity Contracts | Noncurrent assets |  | 120,701 |  |  | Noncurrent liabilities |  | — |
Derivatives not designated as hedging instruments |  |  | $ | 488,411 |  |  |  |  | $ | 8 |
| As of December 31, 2014
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity Contracts | Current assets |  | $ | 402,668 |  |  | Current liabilities |  | $ | — |
Commodity Contracts | Noncurrent assets |  | 189,540 |  |  | Noncurrent liabilities |  | 70 |
Derivatives not designated as hedging instruments |  |  | $ | 592,208 |  |  |  |  | $ | 70 |
Schedule of the potential effects of master netting arrangements | 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 December 31, |  | As of December 31,
Offsetting of Derivative Assets and Liabilities |  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (in thousands)
Gross amounts presented in the accompanying balance sheets |  | $ | 488,411 |  |  | $ | 592,208 |  |  | $ | (8 | ) |  | $ | (70 | )
Amounts not offset in the accompanying balance sheets |  | (8 | ) |  | (70 | ) |  | 8 |  |  | 70 |
Net amounts |  | $ | 488,403 |  |  | $ | 592,138 |  |  | $ | — |  |  | $ | — |
Schedule of gains and losses on derivative instruments in the statement of operations | The following table summarizes the components of derivative gain presented in the accompanying statements of operations:
| For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (in thousands)
Derivative settlement (gain) loss: |  |  |  |  |
Oil contracts | $ | (362,219 | ) |  | $ | (28,410 | ) |  | $ | 15,161 |
Gas contracts (1) | (123,180 | ) |  | 26,706 |  |  | (30,338 | )
NGL contracts | (27,167 | ) |  | (10,911 | ) |  | (6,885 | )
Total derivative settlement gain | $ | (512,566 | ) |  | $ | (12,615 | ) |  | $ | (22,062 | )
Total derivative (gain) loss: |  |  |  |  |
Oil contracts | $ | (191,165 | ) |  | $ | (457,082 | ) |  | $ | 14,665 |
Gas contracts | (189,734 | ) |  | (93,267 | ) |  | (14,053 | )
NGL contracts | (27,932 | ) |  | (32,915 | ) |  | (3,692 | )
Total derivative gain | $ | (408,831 | ) |  | $ | (583,264 | ) |  | $ | (3,080 | )
____________________________________________
(1) | Natural gas derivative settlements for the years ended December 31, 2015, and 2014, include $15.3 million and $5.6 million, respectively, of early settlements of futures contracts as a result of divesting assets in the Company’s Mid-Continent region.
Detail of the effect of derivative instruments reclassified from AOCI to the statement of operations (net of income tax) | The following table details the effect of derivative instruments on AOCL and the accompanying statements of operations (net of income tax):
|  |  | Location on Accompanying Statements of Operations |  | For the Years Ended December 31,
| Derivatives |  |  | 2015 |  | 2014 |  | 2013
|  |  |  |  | (in thousands)
Amount reclassified from AOCL | Commodity Contracts |  | Other operating revenues |  | $ | — |  |  | $ | — |  |  | $ | 1,115 |

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