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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Derivative Instruments | The total notional amounts of production of CNX's derivative instruments at June 30, 2018 and December 31, 2017 were as follows:
| June 30, |  | December 31, |  | Forecasted to
| 2018 |  | 2017 |  | Settle Through
Natural Gas Commodity Swaps (Bcf) | 1,064.1 |  |  | 1,067.2 |  |  | 2023
Natural Gas Basis Swaps (Bcf) | 775.5 |  |  | 688.1 |  |  | 2023
Schedule of Derivative Assets at Fair Value | The gross fair value of CNX's derivative instruments at June 30, 2018 and December 31, 2017 was as follows:
Asset Derivative Instruments |  | Liability Derivative Instruments
| June 30, |  | December 31, |  |  | June 30, |  | December 31,
| 2018 |  | 2017 |  |  | 2018 |  | 2017
Commodity Swaps: |  |  |  |  |  |  |  |
Prepaid Expense | $ | 27,226 |  |  | $ | 62,369 |  |  | Other Accrued Liabilities | $ | 26,943 |  |  | $ | 5,985 |
Other Assets | 132,594 |  |  | 59,281 |  |  | Other Liabilities | 10,381 |  |  | 42,419 |
Total Asset | $ | 159,820 |  |  | $ | 121,650 |  |  | Total Liability | $ | 37,324 |  |  | $ | 48,404 |
Basis Only Swaps: |  |  |  |  |  |  |  |
Prepaid Expense | $ | 10,932 |  |  | $ | 14,965 |  |  | Other Accrued Liabilities | $ | 26,969 |  |  | $ | 35,306 |
Other Assets | 35,101 |  |  | 24,223 |  |  | Other Liabilities | 20,557 |  |  | 17,179 |
Total Asset | $ | 46,033 |  |  | $ | 39,188 |  |  | Total Liability | $ | 47,526 |  |  | $ | 52,485 |
Schedule of Derivative Liabilities at Fair Value | The gross fair value of CNX's derivative instruments at June 30, 2018 and December 31, 2017 was as follows:
Asset Derivative Instruments |  | Liability Derivative Instruments
| June 30, |  | December 31, |  |  | June 30, |  | December 31,
| 2018 |  | 2017 |  |  | 2018 |  | 2017
Commodity Swaps: |  |  |  |  |  |  |  |
Prepaid Expense | $ | 27,226 |  |  | $ | 62,369 |  |  | Other Accrued Liabilities | $ | 26,943 |  |  | $ | 5,985 |
Other Assets | 132,594 |  |  | 59,281 |  |  | Other Liabilities | 10,381 |  |  | 42,419 |
Total Asset | $ | 159,820 |  |  | $ | 121,650 |  |  | Total Liability | $ | 37,324 |  |  | $ | 48,404 |
Basis Only Swaps: |  |  |  |  |  |  |  |
Prepaid Expense | $ | 10,932 |  |  | $ | 14,965 |  |  | Other Accrued Liabilities | $ | 26,969 |  |  | $ | 35,306 |
Other Assets | 35,101 |  |  | 24,223 |  |  | Other Liabilities | 20,557 |  |  | 17,179 |
Total Asset | $ | 46,033 |  |  | $ | 39,188 |  |  | Total Liability | $ | 47,526 |  |  | $ | 52,485 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The effect of derivative instruments on the Company's Consolidated Statements of Income was as follows:
| For the Three Months Ended |  | For the Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: |  |  |  |  |  |  |
Commodity Swaps: |  |  |  |  |  |  |
Natural Gas | $ | 17,058 |  |  | $ | (15,509 | ) |  | $ | 16,624 |  |  | $ | (40,116 | )
Propane | — |  |  | — |  |  | — |  |  | (1,216 | )
Natural Gas Basis Swaps | (374 | ) |  | (16,776 | ) |  | (16,931 | ) |  | (38,056 | )
Total Cash Received (Paid) in Settlement of Commodity Derivative Instruments | 16,684 |  |  | (32,285 | ) |  | (307 | ) |  | (79,388 | )
Unrealized Gain (Loss) on Commodity Derivative Instruments: |  |  |  |  |  |  |
Commodity Swaps: |  |  |  |  |  |  |
Natural Gas | 46,450 |  |  | 70,282 |  |  | 49,250 |  |  | 232,886 |
Propane | — |  |  | — |  |  | — |  |  | 1,147 |
Natural Gas Basis Swaps | (37,474 | ) |  | 45,791 |  |  | 11,804 |  |  | (93,320 | )
Total Unrealized Gain on Commodity Derivative Instruments | 8,976 |  |  | 116,073 |  |  | 61,054 |  |  | 140,713 |
Gain (Loss) on Commodity Derivative Instruments: |  |  |  |  |  |  |
Commodity Swaps: |  |  |  |  |  |  |
Natural Gas | 63,508 |  |  | 54,773 |  |  | 65,874 |  |  | 192,770 |
Propane | — |  |  | — |  |  | — |  |  | (69 | )
Natural Gas Basis Swaps | (37,848 | ) |  | 29,015 |  |  | (5,127 | ) |  | (131,376 | )
Total Gain on Commodity Derivative Instruments | $ | 25,660 |  |  | $ | 83,788 |  |  | $ | 60,747 |  |  | $ | 61,325 |

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