Summary of Significant Accounting Policies Revenue Recognition (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Amount of NGL Sales to Third Parties	$ 285.4	$ 279.8	$ 170.0
Percent of Total NGLs Sales	38.80%	46.00%	49.50%
Chesapeake Energy Marketing Inc. [Member]
Percent of Gathering and Processing Volumes	19.90%
Apache Coporation [Member]
Percent of Gathering and Processing Volumes	15.00%
Devon Energy Production Company [Member]
Percent of Gathering and Processing Volumes	12.50%
BP America Production Company [Member]
Percent of Gathering and Processing Volumes	4.10%
Kaiser Francis Oil Co. [Member]
Percent of Gathering and Processing Volumes	3.90%
Top 10 Producers Total Percentage [Member]
Percent of Gathering and Processing Volumes	69.40%
Percent of Third Party Purchases of NGLs [Member]
percent of third party purchases	50.00%