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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Outstanding commodity derivatives | As of December 31, 2017, the Company had the following outstanding physical commodity derivatives:
Type of Contract |  | Volume |  | Contract Period |  | Weighted-Average Fixed Price
Physical contracts |  |  |  |  |  |  |  |
Natural gas purchase |  | 81.2 |  |  | Bcf |  | Jan. 2018 - Oct. 2018 |  | $3.70
Natural gas sales |  | 11.7 |  |  | Bcf |  | Jan. 2018 - Feb. 2018 |  | $4.71
As of December 31, 2017, the Company had the following outstanding financial commodity derivatives:
|  |  |  |  |  |  | Collars |  |
|  |  |  |  |  |  | Floor |  | Ceiling |  | Basis Swaps
Type of Contract |  | Volume |  | Contract Period |  | Range |  | Weighted-Average |  | Range |  | Weighted- Average |  | Weighted- Average
Financial contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas (Leidy) |  | 17.7 |  | Bcf |  | Jan. 2018 - Dec. 2018 |  |  |  |  |  |  |  |  |  |  |  | $ | (0.71 | )
Natural gas (Transco) |  | 21.3 |  | Bcf |  | Jan. 2018 - Dec. 2019 |  |  |  |  |  |  |  |  |  |  |  | $ | 0.42 |
Crude oil (WTI/LLS) |  | 2.9 |  | Mmbbl |  | Jan. 2018 - Dec. 2018 |  | $— |  | $ | 55.00 |  |  | $63.35-$63.80 |  | $ | 63.62 |  |  |
In January 2018, we entered into the following financial commodity derivatives:
|  |  |  |  |  |  | Swaps |  | Basis Swaps
Type of Contract | Volume |  | Contract Period |  | Weighted- Average |  | Weighted- Average
Financial contracts |  |  |  |  |  |  |  |  |
Natural gas (NYMEX) | 84.4 |  |  | Bcf |  | Feb. 2018 - Dec. 2018 |  | $2.93 |  |
Natural gas (NYMEX) | 13.3 |  |  | Bcf |  | Feb. 2018 - Oct. 2018 |  | $3.10 |  |
Natural gas (Leidy) | 16.2 |  |  | Bcf |  | Feb. 2018 - Dec. 2018 |  |  |  | $(0.68)
Effect of Derivative Instruments on the Consolidated Balance Sheet | Effect of Derivative Instruments on the Consolidated Balance Sheet
|  |  |  | Fair Values of Derivative Instruments
|  |  |  | Derivative Assets |  | Derivative Liabilities
|  |  |  | December 31, |  | December 31,
(In thousands) |  | Balance Sheet Location |  | 2017 |  | 2016 |  | 2017 |  | 2016
Commodity contracts |  | Other assets (non-current) |  | $ | 2,239 |  |  | $ | 2,991 |  |  | $ | — |  |  | $ | — |
Commodity contracts |  | Derivative instruments (current) |  | — |  |  | — |  |  | 30,637 |  |  | 40,259 |
|  |  |  | $ | 2,239 |  |  | $ | 2,991 |  |  | $ | 30,637 |  |  | $ | 40,259 |
Schedule of offsetting of derivative liabilities in the condensed consolidated balance sheet | Offsetting of Derivative Assets and Liabilities in the Consolidated Balance Sheet
|  | December 31,
(In thousands) |  | 2017 |  | 2016
Derivative assets |  |  |  |  |  |
Gross amounts of recognized assets |  | $ | 2,239 |  |  | $ | 2,991 |
Gross amounts offset in the statement of financial position |  | — |  |  | — |
Net amounts of assets presented in the statement of financial position |  | 2,239 |  |  | 2,991 |
Gross amounts of financial instruments not offset in the statement of financial position |  | — |  |  | — |
Net amount |  | $ | 2,239 |  |  | $ | 2,991 |
Derivative liabilities |  |  |  |
Gross amounts of recognized liabilities |  | $ | 30,637 |  |  | $ | 40,259 |
Gross amounts offset in the statement of financial position |  | — |  |  | — |
Net amounts of liabilities presented in the statement of financial position |  | 30,637 |  |  | 40,259 |
Gross amounts of financial instruments not offset in the statement of financial position |  | 241 |  |  | 757 |
Net amount |  | $ | 30,878 |  |  | $ | 41,016 |
Schedule of offsetting of derivative assets in the condensed consolidated balance sheet | Offsetting of Derivative Assets and Liabilities in the Consolidated Balance Sheet
|  | December 31,
(In thousands) |  | 2017 |  | 2016
Derivative assets |  |  |  |  |  |
Gross amounts of recognized assets |  | $ | 2,239 |  |  | $ | 2,991 |
Gross amounts offset in the statement of financial position |  | — |  |  | — |
Net amounts of assets presented in the statement of financial position |  | 2,239 |  |  | 2,991 |
Gross amounts of financial instruments not offset in the statement of financial position |  | — |  |  | — |
Net amount |  | $ | 2,239 |  |  | $ | 2,991 |
Derivative liabilities |  |  |  |
Gross amounts of recognized liabilities |  | $ | 30,637 |  |  | $ | 40,259 |
Gross amounts offset in the statement of financial position |  | — |  |  | — |
Net amounts of liabilities presented in the statement of financial position |  | 30,637 |  |  | 40,259 |
Gross amounts of financial instruments not offset in the statement of financial position |  | 241 |  |  | 757 |
Net amount |  | $ | 30,878 |  |  | $ | 41,016 |
Effect of Derivative Instruments on the Consolidated Statement of Operations | Effect of Derivative Instruments on the Consolidated Statement of Operations
|  | Year Ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015
Cash received (paid) on settlement of derivative instruments |  |  |  |  |  |
Gain (loss) on derivative instruments |  | $ | 8,056 |  |  | $ | (1,682 | ) |  | $ | 194,289 |
Non-cash gain (loss) on derivative instruments |  |  |  |  |  |
Gain (loss) on derivative instruments |  | 8,870 |  |  | (37,268 | ) |  | (137,603 | )
|  | $ | 16,926 |  |  | $ | (38,950 | ) |  | $ | 56,686 |

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