Partners’ Equity, Income Allocations and Cash Distributions 2009 Issuances (Details) (USD $)	1 Months Ended			12 Months Ended
	Dec. 31, 2011	Nov. 30, 2009	May 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2009 Sinclair [Member]	Dec. 02, 2009 Sinclair [Member]	Dec. 31, 2009 Capital Units [Member] Sinclair [Member]	Dec. 02, 2009 Capital Units [Member] Sinclair [Member]
Capital Unit [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares							1,373,609
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned									$ 53,500,000	$ 53,500,000
Business Acquisition, Cost of Acquired Entity, Purchase Price								79,200,000
Partners' Capital Account, Units, Sold in Public Offering	1,475,000	2,185,000	2,192,400
Sale of Common Units, Price Per Share	$ 53.50	$ 35.78	$ 27.80	$ 53.50
Proceeds from Issuance of Common Limited Partners Units	75,800,000	74,900,000	58,400,000	75,815,000	0	133,301,000
General Partners' Contributed Capital	5,900,000			5,900,000		3,800,000
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest				2.00%		2.00%
Public Offering of Securities, Maximum Proceeds Authorized	$ 781,000,000			$ 781,000,000