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Supplemental Oil and Gas Information - Results of Operations for Oil and Gas Producing Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues |  |  |  |  |
Revenues | $ 2,817,100 | $ 1,806,500 |  | $ 1,300,400 |
Other operating revenues | 8,500 | 18,900 |  | 129,400 |
Total revenues | 2,825,600 | 1,825,400 |  | 1,429,800 |
Costs and expenses |  |  |  |  |
Lease operating expenses | 605,200 | 353,800 |  | 299,600 |
Severance and ad valorem taxes | 48,000 | 52,100 |  | 43,700 |
Transportation, gathering and processing | 176,315 | 75,043 | [1] | 0 | [1]
Exploration costs charged to expense | 67,300 | 61,600 |  | 58,600 |
Undeveloped lease amortization | 28,000 | 40,100 |  | 61,800 |
Depreciation, depletion and amortization | 1,125,200 | 755,400 |  | 735,300 |
Accretion of asset retirement obligations | 40,500 | 27,200 |  | 25,300 |
Impairment of assets |  | 20,000 |  |  |
Selling and general expenses | 126,800 | 99,300 |  | 109,700 |
Results of Operations, Expense, Other |  |  |  | 96,000 |
Other expenses (benefits) | 47,400 |  |  |  |
Other expenses |  | 6,200 |  |  |
Total costs and expenses | 2,264,700 | 1,490,700 |  | 1,356,300 |
Results of operations before taxes | 560,900 | 334,700 |  | 73,500 |
Income tax expense (benefit) | 100,300 | 57,300 |  | 7,400 |
Results of operations | 460,600 | 277,400 |  | 66,100 |
Crude Oil and Natural Gas Liquids |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 2,584,800 | 1,586,600 |  | 1,107,400 |
Natural Gas |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 232,300 | 219,900 |  | 193,000 |
United States |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 2,359,700 | 1,331,300 |  | 941,600 |
Other operating revenues | 7,300 | 1,400 |  | 2,700 |
Total revenues | 2,367,000 | 1,332,700 |  | 944,300 |
Costs and expenses |  |  |  |  |
Lease operating expenses | 461,500 | 230,500 |  | 198,500 |
Severance and ad valorem taxes | 46,600 | 50,900 |  | 42,200 |
Transportation, gathering and processing | 140,800 | 43,100 |  |  |
Exploration costs charged to expense | 21,400 | 29,400 |  | 7,800 |
Undeveloped lease amortization | 23,100 | 36,800 |  | 60,200 |
Depreciation, depletion and amortization | 878,700 | 519,500 |  | 546,100 |
Accretion of asset retirement obligations | 34,400 | 19,500 |  | 17,400 |
Impairment of assets |  | 20,000 |  |  |
Selling and general expenses | 74,300 | 49,000 |  | 61,800 |
Results of Operations, Expense, Other |  |  |  | 20,000 |
Other expenses (benefits) | 52,200 |  |  |  |
Other expenses |  | 23,000 |  |  |
Total costs and expenses | 1,733,000 | 1,021,700 |  | 954,000 |
Results of operations before taxes | 634,000 | 311,000 |  | (9,700) |
Income tax expense (benefit) | 115,600 | 68,100 |  | (800) |
Results of operations | 518,400 | 242,900 |  | (8,900) |
United States | Crude Oil and Natural Gas Liquids |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 2,285,800 | 1,277,700 |  | 903,700 |
United States | Natural Gas |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 73,900 | 53,600 |  | 37,900 |
Canada | Canada |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 445,800 | 469,100 |  | 358,800 |
Other operating revenues | 1,200 | 1,400 |  | 126,700 |
Total revenues | 447,000 | 470,500 |  | 485,500 |
Costs and expenses |  |  |  |  |
Lease operating expenses | 142,400 | 122,600 |  | 101,100 |
Severance and ad valorem taxes | 1,400 | 1,200 |  | 1,500 |
Transportation, gathering and processing | 35,500 | 31,900 |  |  |
Exploration costs charged to expense | 600 | 600 |  | 500 |
Undeveloped lease amortization | 1,300 | 800 |  | 1,600 |
Depreciation, depletion and amortization | 243,000 | 232,400 |  | 185,400 |
Accretion of asset retirement obligations | 6,100 | 7,700 |  | 7,900 |
Impairment of assets |  | 0 |  |  |
Selling and general expenses | 30,000 | 26,800 |  | 28,300 |
Results of Operations, Expense, Other |  |  |  | 2,300 |
Other expenses (benefits) | (6,100) |  |  |  |
Other expenses |  | (19,100) |  |  |
Total costs and expenses | 454,200 | 404,900 |  | 328,600 |
Results of operations before taxes | (7,200) | 65,600 |  | 156,900 |
Income tax expense (benefit) | (2,900) | 14,500 |  | 44,400 |
Results of operations | (4,300) | 51,100 |  | 112,500 |
Canada | Crude Oil and Natural Gas Liquids | Canada |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 287,400 | 302,800 |  | 203,700 |
Canada | Natural Gas | Canada |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 158,400 | 166,300 |  | 155,100 |
Other |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 11,600 | 6,100 |  | 0 |
Other operating revenues | 0 | 16,100 |  | 0 |
Total revenues | 11,600 | 22,200 |  | 0 |
Costs and expenses |  |  |  |  |
Lease operating expenses | 1,300 | 700 |  | 0 |
Severance and ad valorem taxes | 0 | 0 |  | 0 |
Transportation, gathering and processing | 0 | 0 |  |  |
Exploration costs charged to expense | 45,300 | 31,600 |  | 50,300 |
Undeveloped lease amortization | 3,600 | 2,500 |  | 0 |
Depreciation, depletion and amortization | 3,500 | 3,500 |  | 3,800 |
Accretion of asset retirement obligations | 0 | 0 |  | 0 |
Impairment of assets |  | 0 |  |  |
Selling and general expenses | 22,500 | 23,500 |  | 19,600 |
Results of Operations, Expense, Other |  |  |  | 73,700 |
Other expenses (benefits) | 1,300 |  |  |  |
Other expenses |  | 2,300 |  |  |
Total costs and expenses | 77,500 | 64,100 |  | 73,700 |
Results of operations before taxes | (65,900) | (41,900) |  | (73,700) |
Income tax expense (benefit) | (12,400) | (25,300) |  | (36,200) |
Results of operations | (53,500) | (16,600) |  | (37,500) |
Other | Crude Oil and Natural Gas Liquids |  |  |  |  |
Revenues |  |  |  |  |
Revenues | 11,600 | 6,100 |  | 0 |
Other | Natural Gas |  |  |  |  |
Revenues |  |  |  |  |
Revenues | $ 0 | $ 0 |  | $ 0 |
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.

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