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Guarantor Subsidiaries Financial Information Guarantor Subsidiaries Comprehensive Income Statement (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Income (Loss) | $ (839,148) | $ (839,148) | $ (364,475) | $ 163,090
Net Income (Loss) Attributable to Noncontrolling Interest |  | 8,954 | 10,410 | 0
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | (33,226) | (86,447) | 94,989
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | 0 |  | (97,316)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (43,470) |  | (18,288)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | (78,051) |
Other Comprehensive Income (Loss), Net of Tax |  | (76,696) | (164,498) | 174,017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (915,844) | (528,973) | 337,107
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 9,216 | 10,410 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | (925,060) | (539,383) | 337,107
Parent Company [Member] |  |  |  |
Net Income (Loss) |  | (848,102) | (374,885) | 163,090
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | (33,226) | (86,447) | 94,989
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | 0 | (97,316)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (43,470) |  | (18,288)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | (78,051) |
Other Comprehensive Income (Loss), Net of Tax |  | (76,696) | (164,498) | 174,017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (924,798) | (539,383) |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 0 | 0 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | (924,798) | (539,383) | 337,107
Cnx Gas Guarantor [Member] |  |  |  |
Net Income (Loss) |  | (228,289) | (421,803) | 123,273
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | (97,316)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | (43,470) |  | (18,288)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | (78,051) |
Other Comprehensive Income (Loss), Net of Tax |  | (43,470) | (78,051) | 79,028
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (271,759) | (499,854) |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 0 | 0 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | (271,759) | (499,854) | 202,301
Other Guarantors Subsidiaries [Member] |  |  |  |
Net Income (Loss) |  | (197,898) | 205,640 | 182,624
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | (34,044) | (84,607) | 53,190
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 |  | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | 0 |
Other Comprehensive Income (Loss), Net of Tax |  | (34,044) | (84,607) | 53,190
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (231,942) | 121,033 |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 0 | 0 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | (231,942) | 121,033 | 235,814
Non-Guarantor Subsidiaries [Member] |  |  |  |
Net Income (Loss) |  | (303,212) | (12,026) | 5,131
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 |  | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | 0 |
Other Comprehensive Income (Loss), Net of Tax |  | 0 | 0 | 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (303,212) | (12,026) |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 0 | 0 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | (303,212) | (12,026) | 5,131
CNX Coal Resources LP [Member] |  |  |  |
Net Income (Loss) |  | 25,851 | 64,538 | 104,875
Net Income (Loss) Attributable to Noncontrolling Interest |  | 0 | 0 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | 818 | (1,840) | 41,799
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 |  | 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | 0 |
Other Comprehensive Income (Loss), Net of Tax |  | 818 | (1,840) | 41,799
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 26,669 | 62,698 |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 0 | 0 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | 26,669 | 62,698 | 146,674
Consolidation, Eliminations [Member] |  |  |  |
Net Income (Loss) |  | 712,502 | 174,061 | (415,903)
Net Income (Loss) Attributable to Noncontrolling Interest |  | 8,954 | 10,410 |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent |  | 33,226 | 86,447 | (94,989)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | 97,316
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 43,470 |  | 18,288
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  | 78,051 |
Other Comprehensive Income (Loss), Net of Tax |  | 76,696 | 164,498 | (174,017)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 789,198 | 338,559 |
Less: Comprehensive Loss (Income), Net of Tax, Attributable to Noncontrolling Interest |  | 9,216 | 10,410 | 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  | $ 779,982 | $ 328,149 | $ (589,920)

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