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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2017
General Discussion of Derivative Instruments and Hedging Activities [Abstract] |
Schedule of Open Fixed Price Swap Positions | Below is a summary of the Company’s open fixed price swap positions as of June 30, 2017.
| Location | Daily Volume (MMBtu/day) |  | Weighted Average Price
Remaining 2017 | NYMEX Henry Hub | 681,000 |  |  | $ | 3.20 |
2018 | NYMEX Henry Hub | 669,000 |  |  | $ | 3.08 |
2019 | NYMEX Henry Hub | 57,000 |  |  | $ | 3.10 |
| Location | Daily Volume (Bbls/day) |  | Weighted Average Price
Remaining 2017 | ARGUS LLS | 2,000 |  |  | $ | 53.12 |
Remaining 2017 | NYMEX WTI | 5,000 |  |  | $ | 54.89 |
2018 | NYMEX WTI | 1,000 |  |  | $ | 55.31 |
| Location | Daily Volume (Bbls/day) |  | Weighted Average Price
Remaining 2017 | Mont Belvieu C3 | 3,000 |  |  | $ | 26.63 |
Remaining 2017 | Mont Belvieu C5 | 250 |  |  | $ | 49.14 |
The Company sold call options and used the associated premiums to enhance the fixed price for a portion of the fixed price natural gas swaps listed above. Each short call option has an established ceiling price. When the referenced settlement price is above the price ceiling established by these short call options, the Company pays its counterparty an amount equal to the difference between the referenced settlement price and the price ceiling multiplied by the hedged contract volumes.
| Location | Daily Volume (MMBtu/day) |  | Weighted Average Price
Remaining 2017 | NYMEX Henry Hub | 65,000 |  |  | $ | 3.11 |
2018 | NYMEX Henry Hub | 103,000 |  |  | $ | 3.25 |
2019 | NYMEX Henry Hub | 35,000 |  |  | $ | 3.11 |
Schedule of Natural Gas Basis Swap Position Derivatives | As of June 30, 2017, the Company had the following natural gas basis swap positions for NGPL Mid-Continent.
| Location | Daily Volume (MMBtu/day) |  | Hedged Differential
Remaining 2017 | NGPL Mid-Continent | 50,000 |  |  | $ | (0.26 | )
2018 | NGPL Mid-Continent | 12,000 |  |  | $ | (0.26 | )
Schedule of Derivative Instruments In Statement Of Financial Position | The following table presents the fair value of the Company’s derivative instruments on a gross basis at June 30, 2017 and December 31, 2016:
| June 30, 2017 |  | December 31, 2016
| (In thousands)
Short-term derivative instruments - asset | $ | 46,416 |  |  | $ | 3,488 |
Long-term derivative instruments - asset | $ | 19,761 |  |  | $ | 5,696 |
Short-term derivative instruments - liability | $ | 28,106 |  |  | $ | 119,219 |
Long-term derivative instruments - liability | $ | 8,198 |  |  | $ | 26,759 |
Schedule of Cash Flow Hedges | The following table presents the gain and loss recognized in Net gain (loss) on natural gas, oil and NGL derivatives in the accompanying consolidated statements of operations for the three and six months ended June 30, 2017 and 2016.
| Net gain (loss) on derivative instruments
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
Natural gas derivatives | $ | 56,668 |  |  | $ | (133,621 | ) |  | $ | 142,945 |  |  | $ | (76,621 | )
Oil derivatives | 8,143 |  |  | (2,628 | ) |  | 19,048 |  |  | (1,346 | )
Natural gas liquids derivatives | 60 |  |  | (1,143 | ) |  | 2,455 |  |  | (1,690 | )
Total | $ | 64,871 |  |  | $ | (137,392 | ) |  | $ | 164,448 |  |  | $ | (79,657 | )
Recognized Derivative Assets | The following table presents the gross amounts of recognized derivative assets and liabilities in the consolidated balance sheets and the amounts that are subject to offsetting under master netting arrangements with counterparties, all at fair value.
| As of June 30, 2017
| Gross Assets (Liabilities) |  | Gross Amounts |  |
| Presented in the |  | Subject to Master |  | Net
| Consolidated Balance Sheets |  | Netting Agreements |  | Amount
| (In thousands)
Derivative assets | $ | 66,177 |  |  | $ | (27,984 | ) |  | $ | 38,193 |
Derivative liabilities | $ | (36,304 | ) |  | $ | 27,984 |  |  | $ | (8,320 | )
| As of December 31, 2016
| Gross Assets (Liabilities) |  | Gross Amounts |  |
| Presented in the |  | Subject to Master |  | Net
| Consolidated Balance Sheets |  | Netting Agreements |  | Amount
| (In thousands)
Derivative assets | $ | 9,184 |  |  | $ | (9,184 | ) |  | $ | — |
Derivative liabilities | $ | (145,978 | ) |  | $ | 9,184 |  |  | $ | (136,794 | )
Recognized Derivative Liabilities | The following table presents the gross amounts of recognized derivative assets and liabilities in the consolidated balance sheets and the amounts that are subject to offsetting under master netting arrangements with counterparties, all at fair value.
| As of June 30, 2017
| Gross Assets (Liabilities) |  | Gross Amounts |  |
| Presented in the |  | Subject to Master |  | Net
| Consolidated Balance Sheets |  | Netting Agreements |  | Amount
| (In thousands)
Derivative assets | $ | 66,177 |  |  | $ | (27,984 | ) |  | $ | 38,193 |
Derivative liabilities | $ | (36,304 | ) |  | $ | 27,984 |  |  | $ | (8,320 | )
| As of December 31, 2016
| Gross Assets (Liabilities) |  | Gross Amounts |  |
| Presented in the |  | Subject to Master |  | Net
| Consolidated Balance Sheets |  | Netting Agreements |  | Amount
| (In thousands)
Derivative assets | $ | 9,184 |  |  | $ | (9,184 | ) |  | $ | — |
Derivative liabilities | $ | (145,978 | ) |  | $ | 9,184 |  |  | $ | (136,794 | )

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