Proved Developed and Undeveloped Reserves, Acquisitions and Divestures

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- Definition

Proved Developed and Undeveloped Reserves, Improved Recovery, Percentage Increase

+ References

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- Definition

Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates Percentage

+ References

No definition available.

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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.

+ References

No definition available.

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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

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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

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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

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- Definition

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

+ References

No definition available.

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- Definition

Production of proved reserves.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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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.

+ 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

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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
-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

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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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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%