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Segment Information - Industry Segment Results (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
numberOfDivisions
numberOfSegments
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]      
Number of divisions | numberOfDivisions 2    
Number of reportable segments | numberOfSegments 4    
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments $ 172,982 $ 376,105 $ (30,212)
Other Revenue and Operating Income 82,459 87,992 116,723
Total Revenue and Other Operating Income 1,257,978 1,922,449 1,730,434
Total Operating Expense 1,697,744 1,736,473 1,226,963
Earnings (Loss) Before Income Tax (602,831) 59,684 1,098,668
Segment Assets 8,041,764 9,060,806 8,592,170
Depreciation, Depletion and Amortization 501,821 508,463 493,423
Capital Expenditures 487,291 1,192,599 1,116,397
Equity in Earnings (Loss) of Affiliates (688) 2,103 5,363
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 896,745 1,364,325 1,577,937
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 105,792 94,027 65,986
Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue 167,390 214,980 184,668
Total Revenue and Other Operating Income   214,980 184,668
NJR Energy Services Company      
Segment Reporting Information [Line Items]      
Revenue   147,540 219,472
Total Revenue and Other Operating Income 167,390 147,540 219,472
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,067,247 1,532,666 1,733,704
Investments in Unconsolidated Equity Affiliates 16,022 16,710 18,663
Corporate, Non-Segment | Natural Gas | Commodity Swap      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments 83,997    
Reportable Subsegments | Exploration and Production | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Expense     321,169
Segment Assets     1,051,600
Depreciation, Depletion and Amortization     11,916
Capital Expenditures     4,843
Reportable Subsegments | Exploration and Production | Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments 337,269 62,418 (60,326)
Other Revenue and Operating Income 64,710 74,314 89,781
Total Revenue and Other Operating Income 1,183,017 1,336,008 1,378,651
Total Operating Expense 709,036 787,488 751,673
Earnings (Loss) Before Income Tax 473,981 548,520 626,978
Segment Assets 6,068,933 6,527,245 6,268,113
Depreciation, Depletion and Amortization 416,441 427,219 404,503
Capital Expenditures 474,545 1,175,091 1,094,471
Reportable Subsegments | Exploration and Production | Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments 39,884 7,335 (8,768)
Other Revenue and Operating Income 0 0 0
Total Revenue and Other Operating Income 154,250 171,228 204,116
Total Operating Expense 127,845 135,778 154,121
Earnings (Loss) Before Income Tax 26,405 35,450 49,995
Segment Assets 1,095,816 1,222,005 1,272,457
Depreciation, Depletion and Amortization 69,745 73,189 77,004
Capital Expenditures 9,789 11,333 17,083
Reportable Subsegments | Exploration and Production | Operating Segments | Other      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments (204,171) 306,352 38,882
Other Revenue and Operating Income 17,749 13,678 26,942
Total Revenue and Other Operating Income (79,289) 415,213 147,667
Total Operating Expense 860,863 813,207  
Earnings (Loss) Before Income Tax (1,103,217) (524,286) 421,695
Segment Assets 877,015 1,311,556  
Depreciation, Depletion and Amortization 15,635 8,055  
Capital Expenditures 2,957 6,175  
Reportable Subsegments | Exploration and Production | Operating Segments | Shale and Other      
Segment Reporting Information [Line Items]      
Equity in Earnings (Loss) of Affiliates (688) 2,103 5,363
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Shale      
Segment Reporting Information [Line Items]      
Revenue 781,038 1,199,276 1,349,196
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Coalbed Methane      
Segment Reporting Information [Line Items]      
Revenue 114,366 163,893 212,884
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Other      
Segment Reporting Information [Line Items]      
Revenue 1,341 1,156 15,857
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Shale      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Coalbed Methane      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Other      
Segment Reporting Information [Line Items]      
Revenue $ 105,792 $ 94,027 $ 65,986