Partners' Capital and Distributions Quarterly Distributions of Available Cash (Details) (USD $)	3 Months Ended					9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Quarterly Distributions of Available Cash [Abstract]
Dividends Payable, Date of Record	Nov. 07, 2014	Aug. 07, 2014	May 08, 2014	Feb. 07, 2014
Dividends Payable, Date of Payment	Nov. 14, 2014	Aug. 14, 2014	May 15, 2014	Feb. 14, 2014
Distributions per common unit	$ 0.5025	$ 0.490	$ 0.480	$ 0.475	$ 0.470	$ 1.4725	$ 1.395