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Supplemental Oil and Gas Information (Unaudited) - Results of Operations for Oil and Gas Producing Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |  |
Revenues | $ 1,751,700 | $ 2,817,100 | $ 1,806,500 |
Other operating revenues | 7,700 | 8,500 | 18,900 |
Total revenues | 1,759,400 | 2,825,600 | 1,825,400 |
Costs and expenses |  |  |  |
Lease operating expenses | 600,100 | 605,200 | 353,800 |
Severance and ad valorem taxes | 28,500 | 48,000 | 52,100 |
Transportation, gathering and processing | 172,399 | 176,315 | 75,043 |
Restructuring expenses | 49,994 | 0 | 0 |
Exploration costs charged to expense | 59,700 | 67,300 | 61,600 |
Undeveloped lease amortization | 26,800 | 28,000 | 40,100 |
Depreciation, depletion and amortization | 964,900 | 1,125,200 | 755,400 |
Accretion of asset retirement obligations | 42,200 | 40,500 | 27,200 |
Impairment of assets | 1,206,284 | 0 | 20,000 | [1]
Selling and general expenses | 48,800 | 126,800 | 99,300 |
Other expenses (benefits) | 21,000 | 47,400 | 6,200 |
Total costs and expenses | 3,157,800 | 2,264,700 | 1,490,700 |
Results of operations before taxes | (1,398,400) | 560,900 | 334,700 |
Income tax expense (benefit) | (263,500) | 100,300 | 57,300 |
Results of operations | (1,134,900) | 460,600 | 277,400 |
Net natural gas revenue |  |  |  |
Costs and expenses |  |  |  |
Restructuring expenses | 1,200 |  |  |
Impairment of assets | 1,192,200 |  |  |
Crude Oil and Natural Gas Liquids |  |  |  |
Revenues |  |  |  |
Revenues | 1,511,600 | 2,584,800 | 1,586,600 |
Natural Gas |  |  |  |
Revenues |  |  |  |
Revenues | 240,100 | 232,300 | 219,900 |
U.S. |  |  |  |
Revenues |  |  |  |
Revenues | 1,405,300 | 2,359,700 | 1,331,300 |
Other operating revenues | 6,500 | 7,300 | 1,400 |
Total revenues | 1,411,800 | 2,367,000 | 1,332,700 |
Costs and expenses |  |  |  |
Lease operating expenses | 476,900 | 461,500 | 230,500 |
Severance and ad valorem taxes | 27,200 | 46,600 | 50,900 |
Transportation, gathering and processing | 127,700 | 140,800 | 43,100 |
Exploration costs charged to expense | 35,500 | 21,400 | 29,400 |
Undeveloped lease amortization | 17,200 | 23,100 | 36,800 |
Depreciation, depletion and amortization | 749,400 | 878,700 | 519,500 |
Accretion of asset retirement obligations | 36,600 | 34,400 | 19,500 |
Impairment of assets |  |  | 20,000 |
Selling and general expenses | 24,600 | 74,300 | 49,000 |
Other expenses (benefits) | 21,500 | 52,200 | 23,000 |
Total costs and expenses | 2,670,300 | 1,733,000 | 1,021,700 |
Results of operations before taxes | (1,258,500) | 634,000 | 311,000 |
Income tax expense (benefit) | (244,200) | 115,600 | 68,100 |
Results of operations | (1,014,300) | 518,400 | 242,900 |
U.S. | Net natural gas revenue |  |  |  |
Costs and expenses |  |  |  |
Restructuring expenses | 1,200 |  |  |
Impairment of assets | 1,152,500 |  |  |
U.S. | Crude Oil and Natural Gas Liquids |  |  |  |
Revenues |  |  |  |
Revenues | 1,335,800 | 2,285,800 | 1,277,700 |
U.S. | Natural Gas |  |  |  |
Revenues |  |  |  |
Revenues | 69,400 | 73,900 | 53,600 |
Canada | Net natural gas revenue |  |  |  |
Costs and expenses |  |  |  |
Restructuring expenses | 0 |  |  |
Canada | Conventional gas |  |  |  |
Revenues |  |  |  |
Revenues | 344,600 | 445,800 | 469,100 |
Other operating revenues | 1,200 | 1,200 | 1,400 |
Total revenues | 345,800 | 447,000 | 470,500 |
Costs and expenses |  |  |  |
Lease operating expenses | 121,600 | 142,400 | 122,600 |
Severance and ad valorem taxes | 1,300 | 1,400 | 1,200 |
Transportation, gathering and processing | 44,700 | 35,500 | 31,900 |
Exploration costs charged to expense | 600 | 600 | 600 |
Undeveloped lease amortization | 400 | 1,300 | 800 |
Depreciation, depletion and amortization | 213,200 | 243,000 | 232,400 |
Accretion of asset retirement obligations | 5,600 | 6,100 | 7,700 |
Impairment of assets |  |  | 0 |
Selling and general expenses | 17,100 | 30,000 | 26,800 |
Other expenses (benefits) | (2,300) | (6,100) | (19,100) |
Total costs and expenses | 402,200 | 454,200 | 404,900 |
Results of operations before taxes | (56,400) | (7,200) | 65,600 |
Income tax expense (benefit) | (21,400) | (2,900) | 14,500 |
Results of operations | (35,000) | (4,300) | 51,100 |
Canada | Conventional gas | Net natural gas revenue |  |  |  |
Costs and expenses |  |  |  |
Impairment of assets | 0 |  |  |
Canada | Crude Oil and Natural Gas Liquids | Conventional gas |  |  |  |
Revenues |  |  |  |
Revenues | 174,000 | 287,400 | 302,800 |
Canada | Natural Gas | Conventional gas |  |  |  |
Revenues |  |  |  |
Revenues | 170,600 | 158,400 | 166,300 |
Other |  |  |  |
Revenues |  |  |  |
Revenues | 1,800 | 11,600 | 6,100 |
Other operating revenues | 0 | 0 | 16,100 |
Total revenues | 1,800 | 11,600 | 22,200 |
Costs and expenses |  |  |  |
Lease operating expenses | 1,600 | 1,300 | 700 |
Severance and ad valorem taxes | 0 | 0 | 0 |
Transportation, gathering and processing | 0 | 0 | 0 |
Exploration costs charged to expense | 23,600 | 45,300 | 31,600 |
Undeveloped lease amortization | 9,200 | 3,600 | 2,500 |
Depreciation, depletion and amortization | 2,300 | 3,500 | 3,500 |
Accretion of asset retirement obligations | 0 | 0 | 0 |
Impairment of assets |  |  | 0 |
Selling and general expenses | 7,100 | 22,500 | 23,500 |
Other expenses (benefits) | 1,800 | 1,300 | 2,300 |
Total costs and expenses | 85,300 | 77,500 | 64,100 |
Results of operations before taxes | (83,500) | (65,900) | (41,900) |
Income tax expense (benefit) | 2,100 | (12,400) | (25,300) |
Results of operations | (85,600) | (53,500) | (16,600) |
Other | Net natural gas revenue |  |  |  |
Costs and expenses |  |  |  |
Restructuring expenses | 0 |  |  |
Impairment of assets | 39,700 |  |  |
Other | Crude Oil and Natural Gas Liquids |  |  |  |
Revenues |  |  |  |
Revenues | 1,800 | 11,600 | 6,100 |
Other | Natural Gas |  |  |  |
Revenues |  |  |  |
Revenues | $ 0 | $ 0 | $ 0 |
[1] | Reclassified to conform with current presentation

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