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Segment Information - Industry Segment Results (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 division segment | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | segment | 4 | 2 |  |
Number of divisions | division | 2 |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain (Loss) on Commodity Derivative Instruments |  | $ (1,632,733) | $ 172,982 | $ 376,105
Other Revenue and Operating Income |  | 105,883 | 82,459 | 87,992
Total Revenue and Other Operating Income |  | 756,792 | 1,257,978 | 1,922,449
Total Operating Expense |  | 1,234,874 | 1,697,744 | 1,736,473
Earnings (Loss) Before Income Tax |  | (636,513) | (602,831) | 59,684
Segment Assets |  | 8,100,751 | 8,041,764 | 9,060,806
Depreciation, Depletion and Amortization |  | 515,118 | 501,821 | 508,463
Capital Expenditures |  | 465,861 | 487,291 | 1,192,599
Natural Gas, NGLs and Oil Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 2,183,929 | 896,745 | 1,364,325
Purchased Gas Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 99,713 | 105,792 | 94,027
Citadel Energy Marketing LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 334,407 |  |
Total Revenue and Other Operating Income |  | 334,407 |  |
Direct Energy Business Marketing LLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 235,760 | 167,390 | 214,980
Total Revenue and Other Operating Income |  | 235,760 | 167,390 | 214,980
NJR Energy Services Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  |  |  | 147,540
Total Revenue and Other Operating Income |  |  |  | 147,540
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 2,364,909 | 1,067,247 | 1,532,666
Investments in Unconsolidated Equity Affiliates |  | 17,301 | 16,022 | 16,710
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 |  |  |  | 813,207
Segment Assets |  |  |  | 1,311,556
Depreciation, Depletion and Amortization |  |  |  | 8,055
Capital Expenditures |  |  |  | 6,175
Reportable Subsegments | Exploration and Production | Operating Segments | Shale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain (Loss) on Commodity Derivative Instruments |  | (492,526) | 337,269 | 62,418
Other Revenue and Operating Income |  | 81,267 | 64,710 | 74,314
Total Revenue and Other Operating Income |  | 1,577,734 | 1,183,017 | 1,336,008
Total Operating Expense |  | 804,004 | 709,036 | 787,488
Earnings (Loss) Before Income Tax |  | 773,730 | 473,981 | 548,520
Segment Assets |  | 6,071,495 | 6,068,933 | 6,527,245
Depreciation, Depletion and Amortization |  | 440,024 | 416,441 | 427,219
Capital Expenditures |  | 453,603 | 474,545 | 1,175,091
Reportable Subsegments | Exploration and Production | Operating Segments | Coalbed Methane |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain (Loss) on Commodity Derivative Instruments |  | (46,304) | 39,884 | 7,335
Other Revenue and Operating Income |  | 0 | 0 | 0
Total Revenue and Other Operating Income |  | 147,274 | 154,250 | 171,228
Total Operating Expense |  | 117,900 | 127,845 | 135,778
Earnings (Loss) Before Income Tax |  | 29,374 | 26,405 | 35,450
Segment Assets |  | 1,047,851 | 1,095,816 | 1,222,005
Depreciation, Depletion and Amortization |  | 58,602 | 69,745 | 73,189
Capital Expenditures |  | 10,880 | 9,789 | 11,333
Reportable Subsegments | Exploration and Production | Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain (Loss) on Commodity Derivative Instruments |  | (1,093,903) | (204,171) | 306,352
Other Revenue and Operating Income |  | 24,616 | 17,749 | 13,678
Total Revenue and Other Operating Income |  | (968,216) | (79,289) | 415,213
Total Operating Expense |  | 312,970 | 860,863 |
Earnings (Loss) Before Income Tax |  | (1,439,617) | (1,103,217) | (524,286)
Segment Assets |  | 981,405 | 877,015 |
Depreciation, Depletion and Amortization |  | 16,492 | 15,635 |
Capital Expenditures |  | 1,378 | 2,957 |
Reportable Subsegments | Exploration and Production | Operating Segments | Shale and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity in Earnings (Loss) of Affiliates |  | 5,780 | 688 | 2,103
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Shale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 1,988,993 | 781,038 | 1,199,276
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Coalbed Methane |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 193,578 | 114,366 | 163,893
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 1,358 | 1,341 | 1,156
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 |  | $ 99,713 | $ 105,792 | $ 94,027

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