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Oil and Gas Reserve Information - Discounted Net Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Beginning of the period | $ 319,232 | $ 216,393 | $ 141,427
Sales of oil and gas production during the period, net of production costs | (59,148) | (47,292) | (29,939)
Acquisitions and divestitures | (143) | 35,182 |
Net change in prices and production costs | (114,219) | (1,345) | 35,537
Revisions of previous quantity estimates, estimated timing of development and other | (64,073) | 53,919 | 38,038
Previously estimated development and abandonment costs incurred during the period | 26,444 | 40,736 | 17,187
Accretion of discount | 31,923 | 21,639 | 14,143
End of period | 140,016 | 319,232 | 216,393
Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Beginning of the period | 130 | 572 | 285
Sales of oil and gas production during the period, net of production costs | (55) | (127) | (28)
Acquisitions and divestitures | (143) | 0 |
Net change in prices and production costs | (24) | 20 | (60)
Revisions of previous quantity estimates, estimated timing of development and other | 260 | (392) | 346
Previously estimated development and abandonment costs incurred during the period | 0 | 0 | 0
Accretion of discount | 13 | 57 | 29
End of period | 181 | 130 | 572
Company's Share of Laramie Energy |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Beginning of the period | 319,102 | 215,821 | 141,142
Sales of oil and gas production during the period, net of production costs | (59,093) | (47,165) | (29,911)
Acquisitions and divestitures | 0 | 35,182 |
Net change in prices and production costs | (114,195) | (1,365) | 35,597
Revisions of previous quantity estimates, estimated timing of development and other | (64,333) | 54,311 | 37,692
Previously estimated development and abandonment costs incurred during the period | 26,444 | 40,736 | 17,187
Accretion of discount | 31,910 | 21,582 | 14,114
End of period | $ 139,835 | $ 319,102 | $ 215,821

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production. + 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 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 Reference 4: 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=68064819&loc=SL6807758-109447 + Details
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