Impact of Derivative Instruments on Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commodity Price Risk Management (loss), net
Derivative [Line Items]
Net settlements	$ 53,301	$ 44,049	$ 120,132	$ 94,461
Net change in fair value of unsettled derivatives	(146,102)	(93,090)	(201,877)	(76,840)
Total commodity price risk management gain (loss), net	(92,801)	(49,041)	(81,745)	17,621
Sales From Natural Gas Marketing
Derivative [Line Items]
Net settlements	53	165	298	396
Net change in fair value of unsettled derivatives	(299)	(124)	(519)	(293)
Total commodity price risk management gain (loss), net	(246)	41	(221)	103
Cost of Natural Gas Marketing
Derivative [Line Items]
Net settlements	(49)	(157)	(277)	(375)
Net change in fair value of unsettled derivatives	346	115	571	264
Total commodity price risk management gain (loss), net	$ 297	$ (42)	$ 294	$ (111)

The amount of cash received during the period on settlement of a hedge.

No definition available.

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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=56946850&loc=SL5624171-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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=56944662&loc=d3e3602-108585

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