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Supplemental Gas Data (unaudited) Future Cash Flow of Proved Reserves (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) usd_per_mcf usd_per_bbl | Dec. 31, 2018 USD ($) usd_per_mcf usd_per_bbl | Dec. 31, 2017 USD ($) usd_per_mcf usd_per_bbl | Dec. 31, 2016 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Revenues | $ 19,489,588 | $ 26,610,100 | $ 19,261,578 |
Production Costs | (7,903,120) | (7,730,451) | (7,234,303) |
Development Costs | (1,121,073) | (1,600,128) | (1,710,585) |
Income Tax Expense | (2,720,994) | (4,147,075) | (2,475,981) |
Future Net Cash Flows | 7,744,401 | 13,132,446 | 7,840,709 |
Discounted to Present Value at a 10% Annual Rate | (4,673,932) | (8,476,989) | (4,709,311) |
Total Standardized Measure of Discounted Net Cash Flows | $ 3,070,469 | $ 4,655,457 | $ 3,131,398 | $ 955,117
Natural Gas |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per barrel) | usd_per_mcf | 2.24 | 3.28 | 2.44 |
Oil |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per barrel) | usd_per_bbl | 44.31 | 51.68 | 38.65 |
NGLs |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Adjusted oil price (in usd per barrel) | usd_per_bbl | 19.10 | 27.58 | 23.61 |

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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in developing proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63094-109448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62455-109447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447 + Details
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