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Segment Information Industry Segment Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | $ 793,248 | $ 726,921 | $ 1,004,924
Sales-Outside |  |  |  |  |  |  |  |  | 1,858,830 | 2,015,957 | 2,621,798
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | (141,021) | 392,942 | 23,193
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 32,038 | 30,967 | 276,242
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 43,256 | 14,450 | 8,999
Freight-Outside | $ 12,519 | $ 9,392 | $ 10,295 | $ 11,447 | $ 13,110 | $ 2,436 | $ 2,750 | $ 5,018 | 46,468 | 20,499 | 23,133
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 2,026,375 | 2,693,339 | 3,204,023
Sales Revenue, Services, Net |  |  |  |  |  |  |  |  | 1,839,571 | 2,474,815 | 2,953,365
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (525,955) | (475,705) | 180,151
Total Assets | 9,183,981 |  | 10,929,902 |  |  |  |  |  | 9,183,981 | 10,929,902 | 11,654,646
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 598,503 | 567,120 | 532,643
Segment Reporting - Capital Expenditures |  |  |  |  |  |  |  |  | 226,820 | 982,934 | 1,459,452
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | (53,078) | (54,897) | (49,791)
Total Reportable Business Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (248,132) | (273,863) | 620,682
Total Assets | 8,217,774 |  | 8,968,585 |  |  |  |  |  | 8,217,774 | 8,968,585 |
All Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  |  |  | (17,574)
Investments in Unconsolidated Equity Affiliates |  |  |  |  |  |  |  |  |  |  | 31,237
Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | 793,248 | 726,921 | 1,004,924
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | (141,021) | 392,942 | 23,193
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 43,256 | 14,450 | 8,999
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 424 | 1,538 | 2,458
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 695,907 | 1,135,851 | 1,039,574
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (378,840) | (678,857) | 189,714
Total Assets | 6,235,568 |  | 6,892,284 |  |  |  |  |  | 6,235,568 | 6,892,284 | 7,364,185
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 417,853 | 370,374 | 323,600
Segment Reporting - Capital Expenditures |  |  |  |  |  |  |  |  | 165,101 | 832,446 | 1,103,656
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | (51,742) | (46,614) | (32,217)
Investments in Unconsolidated Equity Affiliates | 188,376 |  | 234,803 |  |  |  |  |  | 188,376 | 234,803 | 121,721
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 32,038 | 30,967 | 276,242
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 78,229
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 32,038 | 30,967 | 354,471
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (277,399) | (200,304) | (438,073)
Total Assets | 966,124 |  | 939,497 |  |  |  |  |  | 966,124 | 939,497 | 1,186,874
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 12,455 | 19,882 | 35,727
Segment Reporting - Capital Expenditures |  |  |  |  |  |  |  |  | 10,910 | 14,197 | 14,567
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | (1,336) | (8,283) |
Investments in Unconsolidated Equity Affiliates | 2,588 |  | 2,527 |  |  |  |  |  | 2,588 | 2,527 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | (424) | (1,538) | (80,687)
Total Revenue and Other Income |  |  |  |  |  |  |  |  | (424) | (1,538) | (80,687)
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | (424) | (1,538) | (2,458)
Total Assets | 83 |  | 1,021,820 |  |  |  |  |  | 83 | 1,021,820 | 1,009,546
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Capital Expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
PA Operations [Member] | Coal Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales-Outside |  |  |  |  |  |  |  |  | 1,065,582 | 1,289,036 | 1,616,874
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 46,468 | 20,499 | 23,133
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 1,112,050 | 1,309,535 | 1,640,007
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | 130,708 | 404,994 | 430,968
Total Assets | $ 1,982,206 |  | $ 2,076,301 |  |  |  |  |  | 1,982,206 | 2,076,301 | 2,094,041
Depreciation, Depletion and Amortization |  |  |  |  |  |  |  |  | 168,195 | 176,864 | 173,316
Segment Reporting - Capital Expenditures |  |  |  |  |  |  |  |  | 50,809 | 136,291 | 341,229
Coalbed Methane | Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | 174,323 | 200,645 | 340,739
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 52,396 | 67,281 | 4,103
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 424 | 1,538 | 2,458
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 227,143 | 269,464 | 347,300
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | 37,999 | 59,662 | 108,107
Marcellus Shale | Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | 414,484 | 379,453 | 457,679
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 147,282 | 100,785 | 14,764
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 561,766 | 480,238 | 472,443
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | 72,141 | 56,116 | 171,902
Utica Shale [Member] | Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | 163,112 | 92,223 | 86,948
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | 29,285 | 6,430 | 1,247
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Revenue and Other Income |  |  |  |  |  |  |  |  | 192,397 | 98,653 | 88,195
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | 28,390 | (19,428) | 43,645
Other Gas | Gas Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Sales Revenue |  |  |  |  |  |  |  |  | 41,329 | 54,600 | 119,558
Gain (Loss) on Hedging Activity |  |  |  |  |  |  |  |  | (369,984) | 218,446 | 3,079
Sales Revenue, Services, Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales-Purchased Gas |  |  |  |  |  |  |  |  | 43,256 | 14,450 | 8,999
Freight-Outside |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment Reporting - Intersegment Transfers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Revenue and Other Income |  |  |  |  |  |  |  |  | (285,399) | 287,496 | 131,636
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  | $ (517,370) | (775,207) | (133,940)
Duke Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue and Other Income |  |  |  |  |  |  |  |  |  | $ 242,020 |
NJR Energy Services Company [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue and Other Income |  |  |  |  |  |  |  |  |  |  | $ 295,779

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cnx_AllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cnx_GasSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cnx_PAOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cnx_CoalSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cnx_CoalbedMethaneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cnx_MarcellusShaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cnx_UticaShaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ProductOrServiceAxis=cnx_OtherGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |