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Information Regarding Proved Oil and Gas Reserves (Details) Mcf in Thousands, MBbls in Thousands, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2016 USD ($) | May 29, 2015 USD ($) | Mar. 09, 2015 USD ($) | Dec. 31, 2017 USD ($) $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2016 USD ($) $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2015 USD ($) $ / WTIperBbl $ / CIGperMbtu Mcf MBbls | Dec. 31, 2014 Mcf MBbls
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  | 345,196 |  |  |
Investment in Laramie Energy, LLC | $ |  |  |  | $ 0 | $ 55,000 | $ 27,529 |
Proved developed reserve |  |  |  | 206,446 | 189,110 | 78,797 |
Proved undeveloped reserve |  |  |  | 138,750 | 178,181 | 74,681 |
Company |  |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Starting Balance |  |  |  | 420 | 224 | 1,165 |
Revisions of quantity estimate |  |  |  | (139) | (262) | 630 |
Extensions and discoveries |  |  |  | 0 | 0 | 0 |
Production |  |  |  | (59) | (66) | (311) |
Ending Balance |  |  |  |  | 420 | 224 | 1,165
Increase in estimated proved reserves |  |  |  | 22,095 | (213,813) | (76,475) |
Increase in estimated proved reserves, percentage |  |  |  | 6.00% | 139.30% | 33.30% |
Proved developed reserve |  |  |  | 500 | 420 | 224 |
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 |  |  |  | 366,871 | 153,254 | 228,788 |
Revisions of quantity estimate |  |  |  | (3) | (31,672) | 101,553 |
Extensions and discoveries |  |  |  | 0 | 758 | 38,869 |
Acquisitions and divestitures |  |  |  | 0 | 200,045 | (7,091) |
Production |  |  |  | (22,178) | (18,858) | (5,759) |
Ending Balance |  |  |  | 344,696 | 366,871 | 153,254 | 228,788
Increase in estimated proved reserves |  |  |  | 22,178 | (200,045) | (101,553) |
Proved developed reserve |  |  |  | 205,946 | 188,690 | 78,573 |
Proved undeveloped reserve |  |  |  | 138,750 | 178,181 | 74,681 |
Natural Gas |  |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  | 293,434 |  |  |
Proved developed reserve |  |  |  | 174,856 | 159,830 | 65,687 |
Proved undeveloped reserve |  |  |  | 118,578 | 150,302 | 61,775 |
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 |  |  |  | 330 | 188 | 601 |
Revisions of quantity estimate |  |  |  | (109) | (196) | 330 |
Extensions and discoveries |  |  |  | 0 | 0 | 0 |
Production |  |  |  | (47) | (54) | (83) |
Ending Balance |  |  |  |  | 330 | 188 | 601
Proved developed reserve |  |  |  | 392 | 330 | 188 |
Proved undeveloped reserve |  |  |  | 0 | 0 | 0 |
Base Pricing, before adjustments for contractual differentials | $ / CIGperMbtu |  |  |  | 2.68 | 2.29 | 2.39 |
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 |  |  |  | 309,802 | 127,274 | 192,015 |
Revisions of quantity estimate |  |  |  | (1,344) | (28,195) | 86,092 |
Extensions and discoveries |  |  |  | 0 | 638 | 32,041 |
Acquisitions and divestitures |  |  |  | 0 | 168,887 | (5,945) |
Production |  |  |  | (18,104) | (15,192) | (4,745) |
Ending Balance |  |  |  | 293,042 | 309,802 | 127,274 | 192,015
Proved developed reserve |  |  |  | 174,464 | 159,500 | 65,499 |
Proved undeveloped reserve |  |  |  | 118,578 | 150,302 | 61,775 |
Oil |  |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Ending Balance | MBbls |  |  |  | 1,114 |  |  |
Proved developed reserve | MBbls |  |  |  | 665 | 523 | 254 |
Proved undeveloped reserve | MBbls |  |  |  | 449 | 451 | 232 |
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 | 6 | 77 |
Revisions of quantity estimate | MBbls |  |  |  | (2) | (3) | 35 |
Extensions and discoveries | MBbls |  |  |  | 0 | 0 | 0 |
Production | MBbls |  |  |  | (2) | (2) | (36) |
Ending Balance | MBbls |  |  |  |  | 7 | 6 | 77
Proved developed reserve | MBbls |  |  |  | 7 | 7 | 6 |
Proved undeveloped reserve | MBbls |  |  |  | 0 | 0 | 0 |
Base Pricing, before adjustments for contractual differentials | $ / WTIperBbl |  |  |  | 51.34 | 42.75 | 50.28 |
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 |  |  |  | 967 | 480 | 684 |
Revisions of quantity estimate | MBbls |  |  |  | (211) | (53) | 295 |
Extensions and discoveries | MBbls |  |  |  | 0 | 1 | 131 |
Acquisitions and divestitures | MBbls |  |  |  | 0 | 492 | (20) |
Production | MBbls |  |  |  | (71) | (59) | (20) |
Ending Balance | MBbls |  |  |  | 1,107 | 967 | 480 | 684
Proved developed reserve | MBbls |  |  |  | 658 | 516 | 248 |
Proved undeveloped reserve | MBbls |  |  |  | 449 | 451 | 232 |
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 |  |  |  | 7,513 |  |  |
Proved developed reserve | MBbls |  |  |  | 4,600 | 4,357 | 1,931 |
Proved undeveloped reserve | MBbls |  |  |  | 2,913 | 4,195 | 1,919 |
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 |  |  |  | 8 | 0 | 17 |
Revisions of quantity estimate | MBbls |  |  |  | (3) | (8) | 15 |
Extensions and discoveries | MBbls |  |  |  | 0 | 0 | 0 |
Production | MBbls |  |  |  | 0 | 0 | (2) |
Ending Balance | MBbls |  |  |  |  | 8 | 0 | 17
Proved developed reserve | MBbls |  |  |  | 11 | 8 | 0 |
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 |  |  |  | 8,544 | 3,850 | 5,444 |
Revisions of quantity estimate | MBbls |  |  |  | 434 | (526) | 2,281 |
Extensions and discoveries | MBbls |  |  |  | 0 | 19 | 1,007 |
Acquisitions and divestitures | MBbls |  |  |  | 0 | 4,701 | (171) |
Production | MBbls |  |  |  | (608) | (552) | (149) |
Ending Balance | MBbls |  |  |  | 7,502 | 8,544 | 3,850 | 5,444
Proved developed reserve | MBbls |  |  |  | 4,589 | 4,349 | 1,931 |
Proved undeveloped reserve | MBbls |  |  |  | 2,913 | 4,195 | 1,919 |
Laramie Energy Company |  |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Investment in Laramie Energy, LLC | $ |  | $ 13,800 | $ 13,800 |  |  |  |
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 in estimated proved reserves |  |  |  | 30 |  |  |
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 |  |  |
Laramie Energy Company | Piceance Basin |  |  |  |  |  |  |
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |  |  |  |  |
Investment in Laramie Energy, LLC | $ | $ 152,100 |  |  |  |  |  |
Restatement Adjustment | 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] |  |  |  |  |  |  |
Revisions of quantity estimate |  |  |  |  | (19,307) | (7,587) | (23,786)
Revision of estimate percentage |  |  |  |  | 5.00% | 5.00% | 9.00%

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- Definition Proved Developed and Undeveloped Reserves, Improved Recovery, Percentage Increase + References No definition available. + Details
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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 The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + 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=50486907&loc=d3e511914-122862 + 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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