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Oil and Gas Reserve Information (Details) Mcf in Thousands, MBbls in Thousands | 12 Months Ended
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Dec. 31, 2019 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2018 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2017 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | 276,611 |  |
Downward revision of proved undeveloped reserves | 57,212 |  |
Downward revision due to decreases in natural gas prices | 54,520,000 |  |
Proved developed reserve | 276,611 | 318,210 | 206,446
Proved undeveloped reserve | 0 | 105,668 | 138,750
Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 119 | 500 | 420
Revisions of quantity estimate | 270 | (341) | 139
Extensions and discoveries | 0 | 0 | 0
Acquisitions and divestitures | (48) |  |
Production | (26) | (40) | (59)
Ending Balance | 315 | 119 | 500
Increase (decrease) in estimated proved reserves | (147,267) | 78,682 | 22,095
Increase in estimated proved reserves, percentage | (35.00%) | 23.00% | (6.00%)
Proved developed reserve |  | 119 | 500
Proved undeveloped reserve | 0 | 0 | 0
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] |  |  |
Starting Balance | 423,759 | 344,696 | 366,871
Revisions of quantity estimate | (111,732) | 85,875 | 3
Extensions and discoveries | 0 | 0 | 0
Acquisitions and divestitures | 0 | 23,609 | 0
Production | (35,731) | (30,421) | (22,178)
Ending Balance | 276,296 | 423,759 | 344,696
Increase (decrease) in estimated proved reserves | (35,731) |  |
Additions of proved undeveloped reserves |  | 60,679,000 |
Positive revisions from converted proved developed reserves |  | 11,614,000 |
Positive revisions due to performance revisions |  | 13,582,000 |
Proved developed reserve | 276,296 | 318,091 | 205,946
Proved undeveloped reserve | 0 | 105,668 | 138,750
Natural Gas |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | 238,451 |  |
Proved developed reserve | 238,451 | 256,452 | 174,856
Proved undeveloped reserve | 0 | 81,428 | 118,578
Natural Gas | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 89 | 392 | 330
Revisions of quantity estimate | 222 | (269) | 109
Extensions and discoveries | 0 | 0 | 0
Acquisitions and divestitures | (30) |  |
Production | (20) | (34) | (47)
Ending Balance | 261 | 89 | 392
Proved developed reserve |  | 89 | 392
Proved undeveloped reserve | 0 | 0 | 0
Base pricing, before adjustments for contractual differentials | $ / CIGperMbtu | 2.04 | 2.47 | 2.68
Natural Gas | 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] |  |  |
Starting Balance | 337,791 | 293,042 | 309,802
Revisions of quantity estimate | (69,924) | 47,871 | 1,344
Extensions and discoveries | 0 | 0 | 0
Acquisitions and divestitures | 0 | 22,391 | 0
Production | (29,677) | (25,513) | (18,104)
Ending Balance | 238,190 | 337,791 | 293,042
Proved developed reserve | 238,190 | 256,363 | 174,464
Proved undeveloped reserve | 0 | 81,428 | 118,578
Oil |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | MBbls | 939 |  |
Proved developed reserve | MBbls | 939 | 1,424 | 665
Proved undeveloped reserve | MBbls | 0 | 325 | 449
Oil | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 4 | 7 | 7
Revisions of quantity estimate | MBbls | 1 | (2) | 2
Extensions and discoveries | MBbls | 0 | 0 | 0
Acquisitions and divestitures | MBbls | (3) |  |
Production | MBbls | (1) | (1) | (2)
Ending Balance | MBbls | 1 | 4 | 7
Proved developed reserve | MBbls |  | 4 | 7
Proved undeveloped reserve | MBbls | 0 | 0 | 0
Base pricing, before adjustments for contractual differentials | $ / WTIperBbl | 55.85 | 65.56 | 51.34
Oil | 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] |  |  |
Starting Balance | MBbls | 1,745 | 1,107 | 967
Revisions of quantity estimate | MBbls | (681) | 732 | 211
Extensions and discoveries | MBbls | 0 | 0 | 0
Acquisitions and divestitures | MBbls | 0 | 12 | 0
Production | MBbls | (126) | (106) | (71)
Ending Balance | MBbls | 938 | 1,745 | 1,107
Proved developed reserve | MBbls | 938 | 1,420 | 658
Proved undeveloped reserve | MBbls | 0 | 325 | 449
Natural Gas Liquids |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | MBbls | 5,421 |  |
Proved developed reserve | MBbls | 5,421 | 8,869 | 4,600
Proved undeveloped reserve | MBbls | 0 | 3,715 | 2,913
Natural Gas Liquids | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 1 | 11 | 8
Revisions of quantity estimate | MBbls | 7 | (10) | 3
Extensions and discoveries | MBbls | 0 | 0 | 0
Acquisitions and divestitures | MBbls | 0 |  |
Production | MBbls | 0 | 0 | 0
Ending Balance | MBbls | 8 | 1 | 11
Proved developed reserve | MBbls |  | 1 | 11
Proved undeveloped reserve | MBbls | 0 | 0 | 0
Natural Gas Liquids | 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] |  |  |
Starting Balance | MBbls | 12,583 | 7,502 | 8,544
Revisions of quantity estimate | MBbls | (6,287) | 5,602 | (434)
Extensions and discoveries | MBbls | 0 | 0 | 0
Acquisitions and divestitures | MBbls | 0 | 191 | 0
Production | MBbls | (883) | (712) | (608)
Ending Balance | MBbls | 5,413 | 12,583 | 7,502
Proved developed reserve | MBbls | 5,413 | 8,868 | 4,589
Proved undeveloped reserve | MBbls | 0 | 3,715 | 2,913

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + 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 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic 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 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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