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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves (Unaudited) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Beginning present value | $ 104,986 | $ 364,290 | $ 1,045,603
Changes during the year |  |  |
Revenues less production | (122,964) | (61,407) | (155,772)
Net changes in prices, production and other costs | 380,026 | (135,652) | (491,035)
Development costs incurred | 83 | 0 | 90,591
Net changes in future development costs | 446 | (2,167) | 450,162
Extensions and discoveries | 0 | 0 | 11,921
Revisions of previous quantity estimates | 112,926 | (99,533) | (478,238)
Accretion of discount | 6,016 | 36,429 | 101,778
Purchases of reserves in-place | 15,541 | 4,744 | 0
Sales of reserves in-place | (29,792) | (1,067) | (3,331)
Timing differences and other | (34,354) | (651) | (207,389)
Net change for the year | 327,928 | (259,304) | (681,313)
Ending present value | $ 432,914 | $ 104,986 | $ 364,290

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery 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 35A -URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6807758-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62500-109447 + Details
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