Derivative Instruments--Non-Hedge Derivative Gains (Losses) in the Consolidated Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Non-Hedge Derivative Gains (Losses) [Line Items]
Non-hedge derivative (losses) gains	$ 231,320	$ (21,635)	$ 49,685
Swaps [Member]
Non-Hedge Derivative Gains (Losses) [Line Items]
Change in fair value of non-hedge derivatives	59,627	(20,717)	(8,440)
Receipts from (payments on) settlement of non-hedge derivative instruments	(6,607)	5,122	28,716
Costless Collars [Member]
Non-Hedge Derivative Gains (Losses) [Line Items]
Change in fair value of non-hedge derivatives	(1,597)	(23,459)	21,182
Receipts from (payments on) settlement of non-hedge derivative instruments	7,382	14,548	10,229
Enhanced Swaps and Put Options [Member]
Non-Hedge Derivative Gains (Losses) [Line Items]
Change in fair value of non-hedge derivatives	172,533	186	0
Receipts from (payments on) settlement of non-hedge derivative instruments	2,221	0	0
Basis Protection Swaps [Member]
Non-Hedge Derivative Gains (Losses) [Line Items]
Change in fair value of non-hedge derivatives	(1,660)	3,242	(331)
Receipts from (payments on) settlement of non-hedge derivative instruments	$ (579)	$ (557)	$ (1,671)

Income statement impact of (payments for) proceeds from derivative instrument settlements.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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