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Industry Segment Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | $ 25,660 | $ 83,788 | $ 60,747 | $ 61,325 |  |
Other Operating Income | 8,534 | 16,658 | 19,244 | 32,308 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 30,292 | 179,765 | 789,532 | 41,337 |  |
Segment Assets | 8,207,758 | 9,025,195 | 8,207,758 | 9,025,195 | $ 6,931,913 |
Depreciation, Depletion and Amortization | 119,087 | 91,640 | 243,754 | 187,318 |  |
Capital Expenditures | 264,174 | 145,839 | 496,659 | 249,962 |  |
Total Revenue | 402,124 | 371,068 | 897,853 | 690,996 |  |
Equity in earnings of unconsolidated affiliates |  |  | 3,447 | 22,385 | 48,346 |
Investments in unconsolidated equity affiliates |  |  |  |  | $ 175,371 | $ 169,208
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Equity in earnings of unconsolidated affiliates | 1,669 | 10,055 | 3,447 | 22,385 |  |
Investments in unconsolidated equity affiliates | 22,347 | 188,649 | 22,347 | 188,649 |  |
NJR Energy Services Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenue | 36,849 | 34,733 | 115,845 | 91,763 |  |
Direct Energy Business Marketing LLC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Revenue | 34,644 | 40,273 | 92,571 | 86,639 |  |
Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 0 | 0 | 0 | 0 |  |
Other Operating Income | 0 | 0 | 0 | 0 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | (39,628) | 129,070 | 584,268 | 129,813 |  |
Segment Assets | 333,372 | 2,830,375 | 333,372 | 2,830,375 |  |
Depreciation, Depletion and Amortization | 0 | 0 | 0 | 0 |  |
Capital Expenditures | 0 | 0 | 0 | 0 |  |
Total Revenue | 0 | 0 | 0 | 0 |  |
Intersegment Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 0 |  | 0 |  |  |
Other Operating Income | (61) |  | (142) |  |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 0 |  | 0 |  |  |
Segment Assets | (11,166) | 0 | (11,166) | 0 |  |
Depreciation, Depletion and Amortization | 0 |  | 0 |  |  |
Capital Expenditures | 0 |  | 0 |  |  |
Total Revenue | (37,903) |  | (75,908) |  |  |
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 367,930 | 270,622 | 817,862 | 597,363 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 69,920 | 50,695 | 205,264 | (88,476) |  |
Operating Segments [Member] | Marcellus Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 9,128 | (21,545) | (385) | (54,210) |  |
Other Operating Income | 0 | 0 | 0 | 0 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 47,273 | 16,411 | 91,515 | 46,380 |  |
Total Revenue | 187,433 | 132,879 | 382,936 | 289,389 |  |
Operating Segments [Member] | Utica Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 5,371 | (2,063) | 897 | (4,751) |  |
Other Operating Income | 0 | 0 | 0 | 0 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 46,486 | 9,063 | 102,593 | 26,870 |  |
Total Revenue | 113,129 | 37,387 | 238,977 | 88,367 |  |
Operating Segments [Member] | Coalbed Methane [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 2,155 | (6,788) | (275) | (15,987) |  |
Other Operating Income | 0 | 0 | 0 | 0 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 12,405 | (36) | 25,522 | 3,572 |  |
Total Revenue | 49,037 | 45,185 | 104,108 | 94,613 |  |
Operating Segments [Member] | Other Gas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 9,006 | 114,184 | 60,510 | 136,273 |  |
Other Operating Income | 8,595 | 16,658 | 19,386 | 32,308 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | (64,039) | 25,257 | (77,695) | (165,298) |  |
Total Revenue | 29,103 | 155,617 | 122,237 | 218,627 |  |
E&P [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 25,660 | 83,788 | 60,747 | 61,325 |  |
Other Operating Income | 8,595 | 16,658 | 19,386 | 32,308 |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 42,125 | 50,695 | 141,935 | (88,476) |  |
Segment Assets | 6,055,545 | 6,194,820 | 6,055,545 | 6,194,820 |  |
Depreciation, Depletion and Amortization | 111,125 | 91,640 | 226,991 | 187,318 |  |
Capital Expenditures | 238,889 | 145,839 | 455,397 | 249,962 |  |
Total Revenue | 378,702 | 371,068 | 848,258 | 690,996 |  |
CNXM [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
(Loss) Gain on Commodity Derivative Instruments | 0 |  | 0 |  |  |
Other Operating Income | 0 |  | 0 |  |  |
Earnings (Loss) From Continuing Operations Before Income Tax | 27,795 | 0 | 63,329 | 0 |  |
Segment Assets | 1,830,007 | 0 | 1,830,007 | 0 |  |
Depreciation, Depletion and Amortization | 7,962 |  | 16,763 |  |  |
Capital Expenditures | 25,285 |  | 41,262 |  |  |
Total Revenue | 61,325 |  | 125,503 |  |  |
Oil and Gas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 334,517 | 260,306 | 740,140 | 578,069 |  |
Oil and Gas [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 | 0 | 0 | 0 |  |
Oil and Gas [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Oil and Gas [Member] | Operating Segments [Member] | Marcellus Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 178,305 | 154,424 | 383,321 | 343,599 |  |
Oil and Gas [Member] | Operating Segments [Member] | Utica Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 107,758 | 39,450 | 238,080 | 93,118 |  |
Oil and Gas [Member] | Operating Segments [Member] | Coalbed Methane [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 46,882 | 51,973 | 104,383 | 110,600 |  |
Oil and Gas [Member] | Operating Segments [Member] | Other Gas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 1,572 | 14,459 | 14,356 | 30,752 |  |
Oil and Gas [Member] | E&P [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 334,517 | 260,306 | 740,140 | 578,069 |  |
Oil and Gas [Member] | CNXM [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Purchased Gas Revenue [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 9,930 | 10,316 | 27,985 | 19,294 |  |
Purchased Gas Revenue [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 | 0 | 0 | 0 |  |
Purchased Gas Revenue [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Purchased Gas Revenue [Member] | Operating Segments [Member] | Marcellus Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 | 0 | 0 | 0 |  |
Purchased Gas Revenue [Member] | Operating Segments [Member] | Utica Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 | 0 | 0 | 0 |  |
Purchased Gas Revenue [Member] | Operating Segments [Member] | Coalbed Methane [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 | 0 |  | 0 |  |
Purchased Gas Revenue [Member] | Operating Segments [Member] | Other Gas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 9,930 | 10,316 | 27,985 | 19,294 |  |
Purchased Gas Revenue [Member] | E&P [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 9,930 | 10,316 | 27,985 | 19,294 |  |
Purchased Gas Revenue [Member] | CNXM [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 23,483 | $ 0 | 49,737 | $ 0 |  |
Midstream Revenue [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | (37,842) |  | (75,766) |  |  |
Midstream Revenue [Member] | Operating Segments [Member] | Marcellus Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | Operating Segments [Member] | Utica Shale [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | Operating Segments [Member] | Coalbed Methane [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | Operating Segments [Member] | Other Gas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | E&P [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | 0 |  | 0 |  |  |
Midstream Revenue [Member] | CNXM [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contracts with Customers | $ 61,325 |  | $ 125,503 |  |  |

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