Information Regarding Proved Oil and Gas Reserves (Details) Mcf in Thousands, MBbls in Thousands, $ in Thousands			12 Months Ended
May 29, 2015 USD ($)	Mar. 09, 2015 USD ($)	Dec. 31, 2016 USD ($) $ / WTIperBbl $ / CIGperMbtu Mcf MBbls	Dec. 31, 2015 USD ($) $ / WTIperBbl $ / CIGperMbtu Mcf MBbls	Dec. 31, 2014 USD ($) $ / 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			386,598
Investment in Laramie Energy, LLC \| $			$ 55,000	$ 27,529	$ 12
Proved developed reserve			189,110	78,797	58,546
Proved undeveloped reserve			197,488	82,268	195,193
Company
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning Balance			224	1,165	2,078
Revisions of quantity estimate			262	(630)	(211)
Extensions and discoveries			0	0	14
Production			(66)	(311)	(716)
Ending Balance			420	224	1,165
Increase in estimated proved reserves			225,533	(92,674)	17,152
Increase in estimated proved reserves, percentage			140.00%	36.50%	7.00%
Proved developed reserve			420	224	1,165
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]
Beginning Balance			160,841	252,574	234,509
Revisions of quantity estimate			43,392	(117,752)	(1,054)
Extensions and discoveries			758	38,869	24,808
Acquisitions and divestitures			200,045	(7,091)
Production			(18,858)	(5,759)	(5,689)
Ending Balance			386,178	160,841	252,574
Increase in estimated proved reserves			200,045	(117,752)	24,808
Proved developed reserve			188,690	78,573	57,381
Proved undeveloped reserve			197,488	82,268	195,193
Natural Gas
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Ending Balance			326,238
Proved developed reserve			159,830	65,687	49,456
Proved undeveloped reserve			166,408	68,054	162,895
Natural Gas \| Company
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning Balance			188	601	662
Revisions of quantity estimate			196	(330)	65
Extensions and discoveries			0	0	8
Production			(54)	(83)	(134)
Ending Balance			330	188	601
Proved developed reserve			330	188	601
Proved undeveloped reserve			0	0	0
Base Pricing, before adjustments for contractual differentials \| $ / CIGperMbtu			2.29	2.39	4.36
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]
Beginning Balance			133,553	211,750	186,597
Revisions of quantity estimate			38,022	(99,548)	8,876
Extensions and discoveries			638	32,041	21,108
Acquisitions and divestitures			168,887	(5,945)
Production			(15,192)	(4,745)	(4,831)
Ending Balance			325,908	133,553	211,750
Proved developed reserve			159,500	65,499	48,855
Proved undeveloped reserve			166,408	68,054	162,895
Oil
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Ending Balance \| MBbls			1,031
Proved developed reserve \| MBbls			523	254	272
Proved undeveloped reserve \| MBbls			508	255	533
Oil \| Company
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning Balance \| MBbls			6	77	236
Revisions of quantity estimate \| MBbls			3	(35)	(67)
Extensions and discoveries \| MBbls			0	0	1
Production \| MBbls			(2)	(36)	(93)
Ending Balance \| MBbls			7	6	77
Proved developed reserve \| MBbls			7	6	77
Proved undeveloped reserve \| MBbls			0	0	0
Base Pricing, before adjustments for contractual differentials \| $ / WTIperBbl			42.75	50.28	94.99
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]
Beginning Balance \| MBbls			503	728	584
Revisions of quantity estimate \| MBbls			87	(316)	34
Extensions and discoveries \| MBbls			1	131	128
Acquisitions and divestitures \| MBbls			492	(20)
Production \| MBbls			(59)	(20)	(18)
Ending Balance \| MBbls			1,024	503	728
Proved developed reserve \| MBbls			516	248	195
Proved undeveloped reserve \| MBbls			508	255	533
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			9,029
Proved developed reserve \| MBbls			4,357	1,931	1,243
Proved undeveloped reserve \| MBbls			4,672	2,114	4,850
Natural Gas Liquids \| Company
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning Balance \| MBbls			0	17	0
Revisions of quantity estimate \| MBbls			8	(15)	21
Extensions and discoveries \| MBbls			0	0	0
Production \| MBbls			0	(2)	(4)
Ending Balance \| MBbls			8	0	17
Proved developed reserve \| MBbls			8	0	17
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]
Beginning Balance \| MBbls			4,045	6,076	7,401
Revisions of quantity estimate \| MBbls			808	(2,718)	(1,689)
Extensions and discoveries \| MBbls			19	1,007	489
Acquisitions and divestitures \| MBbls			4,701	(171)
Production \| MBbls			(552)	(149)	(125)
Ending Balance \| MBbls			9,021	4,045	6,076
Proved developed reserve \| MBbls			4,349	1,931	1,226
Proved undeveloped reserve \| MBbls			4,672	2,114	4,850
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 \| 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 \| $			$ 157,500

Proved Developed and Undeveloped Reserves, Acquisitions and Divestures

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Proved Developed and Undeveloped Reserves, Improved Recovery, Percentage Increase

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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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)
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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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Volume increase (decrease) of proved reserves of oil and gas.

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Production of proved reserves.

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-Publisher FASB
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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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-Subparagraph (a)
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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
-Publisher FASB
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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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