Ceiling Test (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) $ / mcf $ / bbl $ / Mcfe	Mar. 31, 2015 USD ($) $ / mcf $ / bbl $ / Mcfe
Reserve Quantities [Line Items]
Rate for discounting future cash flows	10.00%
Increase in ceiling test write-downs	$ 18,857	$ 108,911
Mcf of natural gas
Reserve Quantities [Line Items]
Average sales prices \| $ / bbl	45.92	81.33
Barrel of oil
Reserve Quantities [Line Items]
Average sales prices \| $ / mcf	2.19	3.31
Mcfe of Ngl
Reserve Quantities [Line Items]
Average sales prices \| $ / Mcfe	1.91	3.52
Commodity Derivatives \| Cash Flow Hedging
Reserve Quantities [Line Items]
Increase in ceiling test write-downs	$ 800	$ 14,000

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 360
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 10
-Paragraph c
-Subparagraph 4(ii)
-Article 4

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