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Supplemental Gas Data (unaudited) - Future Cash Flow of Proved Reserves (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) usd_per_bbl usd_per_mcf | Dec. 31, 2019 USD ($) usd_per_mcf usd_per_bbl | Dec. 31, 2018 USD ($) usd_per_bbl usd_per_mcf | Dec. 31, 2017 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Revenues | $ 16,577,563 | $ 19,489,588 | $ 26,610,100 |
Production Costs | (6,071,763) | (7,903,120) | (7,730,451) |
Development Costs | (1,957,519) | (1,121,073) | (1,600,128) |
Income Tax Expense | (2,235,205) | (2,720,994) | (4,147,075) |
Future Net Cash Flows | 6,313,076 | 7,744,401 | 13,132,446 |
Discounted to Present Value at a 10% Annual Rate | (3,677,340) | (4,673,932) | (8,476,989) |
Total Standardized Measure of Discounted Net Cash Flows | 2,635,736 | $ 3,070,469 | $ 4,655,457 | $ 3,131,398
Increase in standardized measure of discounted net cash flows | 932,000 |  |  |
Development costs, plugging and abandonment costs | 402,174 |  |  |
Pre-tax discounted basis, plugging and abandonment costs | 18,357 |  |  |
Midstream |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Development costs relating to capital | 286,724 |  |  |
Pre-tax discounted basis, development costs relating to capital | $ 231,512 |  |  |
Natural Gas |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per unit) | usd_per_mcf | 1.70 | 2.24 | 3.28 |
Oil |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per unit) | usd_per_bbl | 35.61 | 44.31 | 51.68 |
NGL |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per unit) | usd_per_bbl | 13.18 | 19.10 | 27.58 |

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