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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments $ 33,414 $ 115,142  
Other Revenue and Operating Income 24,950 23,364  
Total Revenue and Other Operating Income 473,073 416,359  
Total Operating Expense 299,804 843,300  
Earnings (Loss) Before Income Tax 135,404 (457,804)  
Assets 8,069,237 8,528,950 $ 8,041,764
Depreciation, Depletion and Amortization 128,944 129,164  
Capital Expenditures 123,429 152,049  
Investments in unconsolidated equity affiliates 16,172 16,549  
Natural Gas | Commodity Swap      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments (90,909) 158,124  
Natural Gas, NGL and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 381,225 251,494  
Natural Gas, NGL and Oil Revenue | Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income 45,000 45,656  
Natural Gas, NGL and Oil Revenue | NJR Energy Services Company      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income   32,176  
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 33,484 26,359  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 433,775 296,259  
Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments 2,182 86,452  
Other Revenue and Operating Income 19,066 18,406  
Total Revenue and Other Operating Income 363,417 325,352  
Total Operating Expense 188,711 191,948  
Earnings (Loss) Before Income Tax 174,706 133,404  
Assets 6,074,252 6,059,158  
Depreciation, Depletion and Amortization 109,506 107,046  
Capital Expenditures 121,118 147,840  
Operating Segments | Shale | Natural Gas, NGL and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 342,169 220,494  
Operating Segments | Shale | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 0 0  
Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments 222 9,687  
Other Revenue and Operating Income 0 0  
Total Revenue and Other Operating Income 39,126 40,410  
Total Operating Expense 28,555 34,160  
Earnings (Loss) Before Income Tax 10,571 6,250  
Assets 1,082,232 1,145,942  
Depreciation, Depletion and Amortization 15,483 18,438  
Capital Expenditures 2,142 2,452  
Operating Segments | Coalbed Methane | Natural Gas, NGL and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 38,904 30,723  
Operating Segments | Coalbed Methane | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 0 0  
Other      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments 31,010 19,003  
Other Revenue and Operating Income 5,884 4,958  
Total Revenue and Other Operating Income 70,530 50,597  
Total Operating Expense 82,538 617,192  
Earnings (Loss) Before Income Tax (49,873) (597,458)  
Assets 912,753 1,323,850  
Depreciation, Depletion and Amortization 3,955 3,680  
Capital Expenditures 169 1,757  
Equity in earnings (loss) of unconsolidated affiliates 950 161  
Other | Natural Gas | Commodity Swap      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments   54,982  
Other | Natural Gas, NGL and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 152 277  
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: $ 33,484 $ 26,359