Information Regarding Proved Oil and Gas Reserves (Details) Mcf in Thousands, MBbls in Thousands	12 Months Ended
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)

Proved Developed and Undeveloped Reserves, Acquisitions and Divestures

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Proved Developed and Undeveloped Reserves, Additions of Proved Undeveloped Reserves

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Proved Developed and Undeveloped Reserves, Improved Recovery, Percentage Increase

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Proved Developed and Undeveloped Reserves, Positive Revisions Due to Performance Revisions

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Proved Developed and Undeveloped Reserves, Positive Revisions From Converted Proved Developed Reserves

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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)

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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)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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-Name Accounting Standards Codification
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-Subparagraph (SX 210.4-10.(a)(2))
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Volume increase (decrease) of proved reserves of oil and gas.

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Production of proved reserves.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
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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.

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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
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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable 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.

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