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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Gain (loss) incurred in hedging activities.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Industry Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Industry Segment Results (Details) - USD ($) $ in Thousands	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