Significant Accounting Policies (Intangible Assets Table) (Details) (USD $) In Thousands, unless otherwise specified									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2011 Customer Relationships [Member]	Dec. 31, 2012 Dedicated and Non Dedicated Acreage [Member]	Dec. 31, 2011 Dedicated and Non Dedicated Acreage [Member]	Dec. 31, 2012 Total Intangible [Member]	Dec. 31, 2011 Total Intangible [Member]	Dec. 31, 2012 Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross			$ 292,658	$ 255,058	$ 395,652	$ 395,652	$ 688,310	$ 650,710
Finite-Lived Intangible Assets, Accumulated Amortization	263,305	199,248	(130,458)	(101,762)	(132,847)	(97,486)	(263,305)	(199,248)
Finite-Lived Intangible Assets, Net	425,005		162,200	153,296	262,805	298,166	425,005	451,462
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									18 years
Goodwill	$ 152,627	$ 0