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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2016
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following tables summarize the approximate volumes and average contract prices of contracts the Company had in place as of June 30, 2016: Oil Swaps
Contract Period |  | NYMEX WTI Volumes |  | Weighted-Average Contract Price
|  | (MBbls) |  | (per Bbl)
Third quarter 2016 |  | 1,840 |  |  | $ | 71.80 |
Fourth quarter 2016 |  | 1,399 |  |  | $ | 67.73 |
2017 |  | 3,053 |  |  | $ | 45.61 |
All oil swaps |  | 6,292 |  |  |
Oil Collars
Contract Period |  | NYMEX WTI Volumes |  | Weighted- Average Floor Price |  | Weighted- Average Ceiling Price
|  | (MBbls) |  | (per Bbl) |  | (per Bbl)
Third quarter 2016 |  | 672 |  |  | $ | 40.00 |  |  | $ | 51.57 |
Fourth quarter 2016 |  | 881 |  |  | $ | 40.00 |  |  | $ | 51.52 |
2017 |  | 1,018 |  |  | $ | 45.00 |  |  | $ | 51.02 |
All oil collars |  | 2,571 |  |  |  |  |
Natural Gas Swaps
Contract Period |  | Sold Volumes |  | Weighted-Average Contract Price |  | Purchased Volumes |  | Weighted- Average Contract Price |  | Net Volumes
|  | (BBtu) |  | (per MMBtu) |  | (BBtu) |  | (per MMBtu) |  | (BBtu)
Third quarter 2016 |  | 25,724 |  |  | $ | 3.13 |  |  | — |  |  | $ | — |  |  | 25,724 |
Fourth quarter 2016 |  | 26,700 |  |  | $ | 3.34 |  |  | — |  |  | $ | — |  |  | 26,700 |
2017 |  | 88,894 |  |  | $ | 4.04 |  |  | — |  |  | $ | — |  |  | 88,894 |
2018 |  | 53,048 |  |  | $ | 3.75 |  |  | (30,606 | ) |  | $ | 4.27 |  |  | 22,442 |
2019 |  | 24,415 |  |  | $ | 4.34 |  |  | (24,415 | ) |  | $ | 4.34 |  |  | — |
All gas swaps* |  | 218,781 |  |  |  |  | (55,021 | ) |  |  |  | 163,760 |
*Total net volumes of natural gas swaps are comprised of IF El Paso Permian (2%), IF HSC (97%), and IF NNG Ventura (1%). NGL Swaps
|  | OPIS Purity Ethane Mont Belvieu |  | OPIS Propane Mont Belvieu Non-TET |  | OPIS Normal Butane Mont Belvieu Non-TET |  | OPS 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
|  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl) |  | (MBbls) | (per Bbl)
Third quarter 2016 |  | 751 |  | $ | 8.70 |  |  | 863 |  | $ | 19.03 |  |  | 248 |  | $ | 22.90 |  |  | 200 |  | $ | 23.24 |
Fourth quarter 2016 |  | 687 |  | $ | 8.71 |  |  | 792 |  | $ | 18.53 |  |  | 226 |  | $ | 22.91 |  |  | 182 |  | $ | 23.25 |
2017 |  | 3,062 |  | $ | 8.92 |  |  | 721 |  | $ | 20.01 |  |  | — |  | $ | — |  |  | — |  | $ | — |
2018 |  | 2,435 |  | $ | 10.18 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2019 |  | 1,200 |  | $ | 10.92 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
2020 |  | 539 |  | $ | 11.13 |  |  | — |  | $ | — |  |  | — |  | $ | — |  |  | — |  | $ | — |
Total NGL swaps |  | 8,674 |  |  |  | 2,376 |  |  |  | 474 |  |  |  | 382 |  |
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 June 30, 2016
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 145,576 |  |  | Current liabilities |  | $ | 63,492 |
Commodity contracts | Noncurrent assets |  | 113,119 |  |  | Noncurrent liabilities |  | 104,660 |
Derivatives not designated as hedging instruments |  |  | $ | 258,695 |  |  |  |  | $ | 168,152 |
| 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 |
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 |  | June 30, 2016 |  | December 31, 2015 |  | June 30, 2016 |  | December 31, 2015
|  | (in thousands)
Gross amounts presented in the accompanying balance sheets |  | $ | 258,695 |  |  | $ | 488,411 |  |  | $ | (168,152 | ) |  | $ | (8 | )
Amounts not offset in the accompanying balance sheets |  | (158,955 | ) |  | (8 | ) |  | 158,955 |  |  | 8 |
Net amounts |  | $ | 99,740 |  |  | $ | 488,403 |  |  | $ | (9,197 | ) |  | $ | — |
Schedule of derivative (gain) loss | The following table summarizes the components of the derivative (gain) loss presented in the accompanying statements of operations:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in thousands)
Derivative settlement (gain) loss: |  |  |  |  |  |  |
Oil contracts | $ | (72,164 | ) |  | $ | (73,915 | ) |  | $ | (172,156 | ) |  | $ | (180,129 | )
Gas contracts (1) | (31,439 | ) |  | (38,880 | ) |  | (72,492 | ) |  | (73,112 | )
NGL contracts | 1,893 |  |  | — |  |  | (4,090 | ) |  | (20,783 | )
Total derivative settlement (gain) loss | $ | (101,710 | ) |  | $ | (112,795 | ) |  | $ | (248,738 | ) |  | $ | (274,024 | )
Total derivative (gain) loss: |  |  |  |  |  |  |
Oil contracts | $ | 60,773 |  |  | $ | 66,749 |  |  | $ | 50,341 |  |  | $ | (7,111 | )
Gas contracts | 62,489 |  |  | 6,070 |  |  | 38,466 |  |  | (76,269 | )
NGL contracts | 40,089 |  |  | 8,110 |  |  | 60,316 |  |  | 10,142 |
Total derivative (gain) loss: | $ | 163,351 |  |  | $ | 80,929 |  |  | $ | 149,123 |  |  | $ | (73,238 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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