Crestwood Transaction And Midstream Operations (Balance Sheet Items) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Property, plant and equipment - net	$ 3,376,805	$ 3,067,845
Total assets	3,763,474	3,512,334
Other non-current liabilities	28,461	28,461
Midstream Operations [Member]
Accounts receivable - net		57
Property, plant and equipment - net		27,121
Total assets		27,178
Other non-current liabilities		1,431
Total		$ 1,431