Condensed Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Revenue
Production	$ 104,546		$ 156,288	[1]	$ 358,281		$ 473,053	[1]
Sales of purchased natural gas	15,130		21,313	[1]	50,373		42,841	[1]
Net derivative gains (losses) (including realized gains of $8,009 and $12,376; $14,129 and $35,059, respectively)	32,733		(60,377)	[1]	36,202		(33,902)	[1]
Other	707		964	[1]	2,462		3,080	[1]
Total revenue	153,116		118,188		447,318		485,072
Operating expense
Lease operating	18,591		22,115	[1]	63,699		72,405	[1]
Gathering, processing and transportation	35,567		41,338	[1]	112,064		127,039	[1]
Production and ad valorem taxes	4,678		6,881	[1]	15,462		20,833	[1]
Costs of purchased natural gas	15,114		21,254	[1]	50,311		42,528	[1]
Depletion, depreciation and accretion	14,390		34,014	[1]	47,911		136,469	[1]
Impairment	0		551,132	[1]	0		2,068,787	[1]
General and administrative	10,471		17,335	[1]	43,509		54,835	[1]
Other operating	2,230		670	[1]	4,435		821	[1]
Total expense	101,041		694,739		337,391		2,523,717
Crestwood earn-out							41,097
Operating income (loss)	60,049		(576,551)		451,073		(1,997,548)
Other income - net	667		(395)	[1]	(14,588)		(237)	[1]
Fortune Creek accretion	(4,818)		(4,978)	[1]	(14,490)		(14,549)	[1]
Interest expense	(39,355)		(42,102)	[1]	(210,535)		(122,348)	[1]
Income (loss) before income taxes	16,543		(624,026)		211,460		(2,134,682)
Income tax (expense) benefit	(5,966)		(166,494)	[1]	(18,063)		330,575	[1]
Net income (loss)	10,577		(790,520)		193,397		(1,804,107)
Net Income (Loss) Attributable to Parent	10,577		(790,520)		193,397		(1,804,107)
Reclassification adjustments related to settlements of derivative contracts into production revenue- net of income tax	(11,139)		(34,145)	[1]	(37,181)		(99,726)	[1]
Net change in derivative fair value - net of income tax	0		(11,905)	[1]	0		60,305	[1]
Foreign currency translation adjustment	2,345		(565)	[1]	(933)		(5,495)	[1]
Other comprehensive income (loss)	(8,794)		(46,615)		(38,114)		(44,916)
Comprehensive income (loss)	1,783		(837,135)		155,283		(1,849,023)
Earnings (loss) per common share - basic	$ 0.06		$ (4.65)	[1]	$ 1.10		$ (10.61)	[1]
Earnings (loss) per common share - diluted	$ 0.06	[2]	$ (4.65)	[1],[2]	$ 1.10	[2]	$ (10.61)	[1],[2]
Tokyo Gas [Member]
Operating expense
Crestwood earn-out	7,974		0	[1]	341,146
Gain (Loss) on Disposition of Oil and Gas and Timber Property					341,146		0	[1]
kwk_CrestwoodLP [Member]
Operating expense
Crestwood earn-out	$ 0		$ 0	[1]	$ 0		$ 41,097	[1]

[1] Note 1 contains additional information

[2] For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the three months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation. For the nine months ended September 30, 2012, 5.0 million shares associated with our stock options and 0.3 million shares associated with our unvested restricted stock units were antidilutive; therefore, excluded from the diluted share calculation.