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v3.19.1

Information Regarding Proved Oil and Gas Reserves (Details) Mcf in Thousands, MBbls in Thousands | 12 Months Ended
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Dec. 31, 2018 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2017 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2016 $ / WTIperBbl $ / CIGperMbtu Mcf MBbls
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | 423,878 |  |
Proved developed reserve | 318,210 | 206,446 | 189,110
Proved undeveloped reserve | 105,668 | 138,750 | 178,181
Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 500 | 420 | 224
Revisions of quantity estimate | (341) | 139 | 262
Extensions and discoveries | 0 | 0 | 0
Production | (40) | (59) | (66)
Ending Balance |  | 500 | 420
Increase (decrease) in estimated proved reserves | 78,682 | (22,095) |
Increase in estimated proved reserves, percentage | 23.00% | (6.00%) |
Proved developed reserve | 119 | 500 | 420
Proved undeveloped reserve | 0 | 0 | 0
Company's Share of Laramie Energy |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 344,696 | 366,871 | 153,254
Revisions of quantity estimate | 85,875 | 3 | 31,672
Extensions and discoveries | 0 | 0 | 758
Acquisitions and divestitures | 23,609 | 0 | 200,045
Production | (30,421) | (22,178) | (18,858)
Ending Balance | 423,759 | 344,696 | 366,871
Increase (decrease) in estimated proved reserves | (30,421) |  |
Additions of proved undeveloped reserves | 60,679 |  |
Positive revisions from converted proved developed reserves | 11,614 |  |
Positive revisions due to performance revisions | 13,582 |  |
Proved developed reserve | 318,091 | 205,946 | 188,690
Proved undeveloped reserve | 105,668 | 138,750 | 178,181
Natural Gas |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | 337,880 |  |
Proved developed reserve | 256,452 | 174,856 | 159,830
Proved undeveloped reserve | 81,428 | 118,578 | 150,302
Natural Gas | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 392 | 330 | 188
Revisions of quantity estimate | (269) | 109 | 196
Extensions and discoveries | 0 | 0 | 0
Production | (34) | (47) | (54)
Ending Balance |  | 392 | 330
Proved developed reserve | 89 | 392 | 330
Proved undeveloped reserve | 0 | 0 | 0
Base Pricing, before adjustments for contractual differentials | $ / CIGperMbtu | 2.47 | 2.68 | 2.29
Natural Gas | Company's Share of Laramie Energy |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | 293,042 | 309,802 | 127,274
Revisions of quantity estimate | 47,871 | 1,344 | 28,195
Extensions and discoveries | 0 | 0 | 638
Acquisitions and divestitures | 22,391 | 0 | 168,887
Production | (25,513) | (18,104) | (15,192)
Ending Balance | 337,791 | 293,042 | 309,802
Proved developed reserve | 256,363 | 174,464 | 159,500
Proved undeveloped reserve | 81,428 | 118,578 | 150,302
Oil |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | MBbls | 1,749 |  |
Proved developed reserve | MBbls | 1,424 | 665 | 523
Proved undeveloped reserve | MBbls | 325 | 449 | 451
Oil | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 7 | 7 | 6
Revisions of quantity estimate | MBbls | (2) | 2 | 3
Extensions and discoveries | MBbls | 0 | 0 | 0
Production | MBbls | (1) | (2) | (2)
Ending Balance | MBbls |  | 7 | 7
Proved developed reserve | MBbls | 4 | 7 | 7
Proved undeveloped reserve | MBbls | 0 | 0 | 0
Base Pricing, before adjustments for contractual differentials | $ / WTIperBbl | 65.56 | 51.34 | 42.75
Oil | Company's Share of Laramie Energy |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 1,107 | 967 | 480
Revisions of quantity estimate | MBbls | 732 | 211 | 53
Extensions and discoveries | MBbls | 0 | 0 | 1
Acquisitions and divestitures | MBbls | 12 | 0 | 492
Production | MBbls | (106) | (71) | (59)
Ending Balance | MBbls | 1,745 | 1,107 | 967
Proved developed reserve | MBbls | 1,420 | 658 | 516
Proved undeveloped reserve | MBbls | 325 | 449 | 451
Natural Gas Liquids |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Ending Balance | MBbls | 12,584 |  |
Proved developed reserve | MBbls | 8,869 | 4,600 | 4,357
Proved undeveloped reserve | MBbls | 3,715 | 2,913 | 4,195
Natural Gas Liquids | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 11 | 8 | 0
Revisions of quantity estimate | MBbls | (10) | 3 | 8
Extensions and discoveries | MBbls | 0 | 0 | 0
Production | MBbls | 0 | 0 | 0
Ending Balance | MBbls |  | 11 | 8
Proved developed reserve | MBbls | 1 | 11 | 8
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 Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Starting Balance | MBbls | 7,502 | 8,544 | 3,850
Revisions of quantity estimate | MBbls | 5,602 | (434) | 526
Extensions and discoveries | MBbls | 0 | 0 | 19
Acquisitions and divestitures | MBbls | 191 | 0 | 4,701
Production | MBbls | (712) | (608) | (552)
Ending Balance | MBbls | 12,583 | 7,502 | 8,544
Proved developed reserve | MBbls | 8,868 | 4,589 | 4,349
Proved undeveloped reserve | MBbls | 3,715 | 2,913 | 4,195
Laramie Energy Company | Company |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Increase (decrease) in estimated proved reserves |  | 30,362 |
Laramie Energy Company | Company's Share of Laramie Energy |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Revisions of quantity estimate |  | (17,216) |

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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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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/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61884-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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