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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
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 December 31, 2016.
| Location | Daily Volume (MMBtu/day) |  | Weighted Average Price
2017 | NYMEX Henry Hub | 531,171 |  |  | $ | 3.17 |
2018 | NYMEX Henry Hub | 296,438 |  |  | $ | 3.10 |
2019 | NYMEX Henry Hub | 4,932 |  |  | $ | 3.37 |
| Location | Daily Volume (Bbls/day) |  | Weighted Average Price
2017 | ARGUS LLS | 1,748 |  |  | $ | 51.97 |
2017 | NYMEX WTI | 3,353 |  |  | $ | 54.98 |
2018 | NYMEX WTI | 899 |  |  | $ | 55.31 |
| Location | Daily Volume (Bbls/day) |  | Weighted Average Price
2017 | Mont Belvieu C3 | 1,630 |  |  | $ | 25.70 |
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
2017 | NYMEX Henry Hub | 60,068 |  |  | $ | 3.12 |
2018 | NYMEX Henry Hub | 4,932 |  |  | $ | 2.91 |
Schedule of Natural Gas Basis Swap Positions | As of December 31, 2016, the Company had the following natural gas basis swap positions for Tetco M2.
| Location | Daily Volume (MMBtu/day) |  | Weighted Average Price
2017 | Tetco M2 | 12,329 |  |  | $ | (0.59 | )
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 December 31, 2016 and 2015:
| December 31,
| 2016 |  | 2015
| (In thousands)
Short-term derivative instruments - asset | $ | 3,488 |  |  | $ | 142,794 |
Long-term derivative instruments - asset | $ | 5,696 |  |  | $ | 51,088 |
Short-term derivative instruments - liability | $ | 119,219 |  |  | $ | 437 |
Long-term derivative instruments - liability | $ | 26,759 |  |  | $ | 6,935 |
Schedule of Cash Flow Hedges | The following table presents the gain and loss recognized in Net (loss) gain on gas, oil and NGL derivatives in the accompanying consolidated statements of operations due to derivative instruments for the years ended December 31, 2016, 2015, and 2014.
| Gain (loss) on derivative instruments
| For the Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (In thousands)
Natural gas derivatives | $ | (165,933 | ) |  | $ | 182,993 |  |  | $ | 103,128 |
Oil derivatives | (5,387 | ) |  | 19,201 |  |  | 6,171 |
Natural gas liquids derivatives | (3,186 | ) |  | 1,319 |  |  | — |
Total | $ | (174,506 | ) |  | $ | 203,513 |  |  | $ | 109,299 |
Recognized Derivative Assets | The following table presents the gross amounts of recognized derivative assets and liabilities, the amounts offset under master netting arrangements with counterparties, and the resulting net amounts presented in the consolidated balance sheets as of the dates presented, all at fair value.
| As of December 31, 2016
| Derivative instruments, gross |  | Netting adjustments |  | Derivative instruments, net
| (In thousands)
Derivative assets | $ | 9,184 |  |  | $ | (9,184 | ) |  | $ | — |
Derivative liabilities | $ | (145,978 | ) |  | $ | 9,184 |  |  | $ | (136,794 | )
| As of December 31, 2015
| Derivative instruments, gross |  | Netting adjustments |  | Derivative instruments, net
| (In thousands)
Derivative assets | $ | 193,882 |  |  | $ | (7,372 | ) |  | $ | 186,510 |
Derivative liabilities | $ | (7,372 | ) |  | $ | 7,372 |  |  | $ | — |
Recognized Derivative Liabilities | The following table presents the gross amounts of recognized derivative assets and liabilities, the amounts offset under master netting arrangements with counterparties, and the resulting net amounts presented in the consolidated balance sheets as of the dates presented, all at fair value.
| As of December 31, 2016
| Derivative instruments, gross |  | Netting adjustments |  | Derivative instruments, net
| (In thousands)
Derivative assets | $ | 9,184 |  |  | $ | (9,184 | ) |  | $ | — |
Derivative liabilities | $ | (145,978 | ) |  | $ | 9,184 |  |  | $ | (136,794 | )
| As of December 31, 2015
| Derivative instruments, gross |  | Netting adjustments |  | Derivative instruments, net
| (In thousands)
Derivative assets | $ | 193,882 |  |  | $ | (7,372 | ) |  | $ | 186,510 |
Derivative liabilities | $ | (7,372 | ) |  | $ | 7,372 |  |  | $ | — |

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