Ceiling Test (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) $ / mcf $ / Mcfe $ / bbl
Reserve Quantities [Line Items]
Rate for discounting future cash flows	10.00%
Decrease (Increase) in ceiling test write-downs	$ 0	$ 18,857
Mcf of natural gas
Reserve Quantities [Line Items]
Average sales prices \| $ / mcf		2.19
Barrel of oil
Reserve Quantities [Line Items]
Average sales prices \| $ / bbl		45.92
Mcfe of Ngl
Reserve Quantities [Line Items]
Average sales prices \| $ / Mcfe		1.91
Commodity Derivatives \| Cash Flow Hedging
Reserve Quantities [Line Items]
Decrease (Increase) in ceiling test write-downs		$ 800

Rate for discounting future cash flows.

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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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+ References

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- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: 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(c)(4)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

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