Condensed Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Production	$ 208,064	$ 218,249	$ 606,070	$ 631,499
Sales of purchased natural gas	20,130	16,982	60,116	50,027
Other	31,699	2,469	54,340	6,902
Total revenue	259,893	237,700	720,526	688,428
Operating expense:
Lease operating	27,673	20,949	73,366	62,438
Gathering, processing and transportation	51,113	18,422	142,201	51,080
Production and ad valorem taxes	7,757	9,201	23,844	26,617
Costs of purchased natural gas	19,954	14,638	59,254	51,701
Other operating	145	1,320	328	3,544
Depletion, depreciation and accretion	57,686	52,542	164,861	149,968
Impairment		31,531	49,063	31,531
General and administrative	27,584	24,005	61,745	61,745
Total expense	191,912	172,608	574,662	438,624
Operating income	67,981	65,092	145,864	249,804
Income (loss) from earnings of BBEP	14,370	17,024	(32,721)	24,203
Other income - net	11,142	14,253	135,441	67,646
Interest expense	(48,393)	(51,532)	(142,123)	(142,171)
Income before income taxes	45,100	44,837	106,461	199,482
Income tax expense	(16,414)	(18,268)	(39,946)	(71,569)
Net income	28,686	26,569	66,515	127,913
Net income attributable to noncontrolling interests		(4,766)		(11,119)
Net income attributable to Quicksilver	28,686	21,803	66,515	116,794
Other comprehensive income (loss) net of tax:
Reclassification adjustments related to settlements of derivative contracts - net of income tax	(11,869)	(45,356)	(38,886)	(117,714)
Net change in derivative fair value - net of income tax	51,221	59,217	44,508	171,910
Foreign currency translation adjustment	(35,550)	6,993	(25,118)	4,238
Other comprehensive income (loss)	3,802	20,854	(19,496)	58,434
Comprehensive income	$ 32,488	$ 42,657	$ 47,019	$ 175,228
Earnings per common share - basic	$ 0.17	$ 0.13	$ 0.39	$ 0.69
Earnings per common share - diluted	$ 0.17	$ 0.13	$ 0.39	$ 0.68