Crestwood Transaction And Midstream Operations (Operating Results) (Details) (USD $) In Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010		Sep. 30, 2011	Sep. 30, 2010
Other operations	$ 145	$ 1,320		$ 328	$ 3,544
General and administrative expense	27,584	24,005		61,745	61,745
Operating results of midstream operations	67,981	65,092		145,864	249,804
Income tax expense	(16,414)	(18,268)		(39,946)	(71,569)
Midstream Operations [Member]
Revenue from third parties		4,371			11,928
GPT expense		(20,923)	[1]		(55,261)	[1]
Ad valorem taxes		1,032			3,597
Other operations		1,101			3,099
DD&A		5,710			16,759
General and administrative expense		3,290			5,035
Operating results of midstream operations		14,161			38,699
Interest and other expense		(2,527)			(6,916)
Results of midstream operations before income tax		11,634			31,783
Income tax expense		(4,101)			(11,235)
Results of midstream operations, net of income tax		$ 7,533			$ 20,548

[1] Our KGS operations earned revenue from gathering and processing of our natural gas and NGL production. This revenue was consolidated as a reduction of processing, gathering and transportation expense for purposes of presenting our consolidated statements of income.