Supplementary Information on Oil and Gas Operations-Unaudited - Proved Reserves (Details) Mcfe in Thousands, MMcf in Thousands, MBbls in Thousands	12 Months Ended
Dec. 31, 2016 Mcfe MBbls MMcf	Dec. 31, 2015 Mcfe MBbls MMcf	Dec. 31, 2014 Mcfe MBbls MMcf
Oil
Proved Developed and Undeveloped Reserves [Abstract]
Proved reserves beginning balance \| MBbls	1,806	2,437	3,031
Revisions of previous estimates \| MBbls	247	(211)	(37)
Extensions, discoveries and other additions \| MBbls	0	163	475
Sale of reserves in place \| MBbls	(154)	(54)	(229)
Production \| MBbls	(502)	(529)	(803)
Proved reserves ending balance \| MBbls	1,397	1,806	2,437
Proved developed reserves \| MBbls	1,212	1,549	2,089
Proved undeveloped reserve \| MBbls	185	257	348
Natural Gas Liquids
Proved Developed and Undeveloped Reserves [Abstract]
Proved reserves, ending balance	34,826	73,498	28,430
Revisions of previous estimates	(4,380)	(3,571)	2,894
Extensions, discoveries and other additions	0	16,078	49,990
Sale of reserves in place	0	(45,692)	(334)
Production	(3,871)	(5,487)	(7,482)
Proved reserves, ending balance	26,575	34,826	73,498
Proved undeveloped reserve	13,073	15,792	42,584
Proved developed reserves	13,502	19,034	30,914
Natural Gas
Proved Developed and Undeveloped Reserves [Abstract]
Proved reserves beginning balance \| MMcf	132,344	309,025	250,109
Revisions of previous estimates \| MMcf	(11,854)	(9,852)	9,976
Extensions, discoveries and other additions \| MMcf	1,485	45,645	82,364
Sale of reserves in place \| MMcf	(24,834)	(186,972)	(2,396)
Production \| MMcf	(16,617)	(25,502)	(31,028)
Proved reserves ending balance \| MMcf	80,524	132,344	309,025
Proved developed reserves \| MMcf	47,349	78,533	182,567
Proved undeveloped reserve \| MMcf	33,175	53,811	126,458
Oil and Natural Gas Reserves
Proved Developed and Undeveloped Reserves [Abstract]
Proved reserves, ending balance	178,004	397,148	296,723
Revisions of previous estimates	(14,748)	(14,698)	12,650
Extensions, discoveries and other additions	1,485	62,702	135,205
Sale of reserves in place	(25,759)	(232,988)	(4,105)
Production	(23,501)	(34,160)	(43,325)
Proved reserves, ending balance	115,481	178,004	397,148
Proved undeveloped reserve	67,694	103,615	237,688
Proved developed reserves	47,787	74,389	159,460

Proved Developed and Undeveloped Reserves, Extensions, Discoveries and Additions, Equivalent

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Proved Developed and Undeveloped Reserves, Net, Equivalent

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Proved Developed and Undeveloped Reserves, Production, Equivalent

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Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates, Equivalent

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Proved Developed and Undeveloped Reserves, Sales of Minerals in Place, Equivalent

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Proved Developed Reserves (Volume), Equivalent

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Proved Undeveloped Reserves (Volume), Equivalent

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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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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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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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Production of proved reserves.

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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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Sales of minerals in place.

+ 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 (f)
-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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