Investments (Details)																			12 Months Ended
	Dec. 31, 2013 Cortez Pipeline Company [Member]	May 25, 2012 Fort Union Pipeline [Member]	May 25, 2012 Double Eagle [Member]	May 25, 2012 Eagle Ford Gathering LLC [Member]	Dec. 31, 2013 Midcontinent Express Pipeline LLC [Member]	Dec. 31, 2013 EagleHawk Field Services LLC [Member]	Dec. 31, 2013 Plantation Pipe Line Company [Member]	Dec. 31, 2013 Red Cedar Gathering Company [Member]	Dec. 31, 2013 Fayettville Express Pipeline LLC [Member]	Dec. 31, 2013 Parkway Pipeline LLC [Member]	Dec. 31, 2013 Watco Companies, LLC [Member]	Dec. 31, 2013 Regency Energy Partners L.P. [Member] Midcontinent Express Pipeline LLC [Member]	Dec. 31, 2013 BHP Billiton [Member] EagleHawk Field Services LLC [Member]	Dec. 31, 2013 Southern Ute Indian Tribe [Member] Red Cedar Gathering Company [Member]	Dec. 31, 2013 Energy Transfer Partners L.P. [Member] Fayettville Express Pipeline LLC [Member]	Dec. 31, 2013 Valero Energy Corp. [Member] Parkway Pipeline LLC [Member]	Dec. 31, 2013 Exxon Mobil Corporation [Member] Cortez Pipeline Company [Member]	Dec. 31, 2013 Cortez Vickers Pipeline Company [Member] Cortez Pipeline Company [Member]	Dec. 31, 2013 May 31st [Member] Goodwill [Member] segment	Dec. 31, 2013 Watco Companies, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	37.00%	50.00%	50.00%	50.00%	25.00%	51.17%	49.00%	50.00%	50.00%		50.00%	75.00%	51.00%	50.00%	50.00%	37.00%	13.00%
Number of Operating Segments																			7
Investment Owned, Balance, Shares																				100,000
Quarterly preferred distribution rate											3.25%
Profit participation rate											0.50%