Partners' Capital and Distributions Quarterly Distributions of Available Cash (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Quarterly Distributions of Available Cash [Abstract]
Dividends Payable, Date of Record	Aug. 07, 2014	May 08, 2014	Feb. 07, 2014
Dividends Payable, Date of Payment	Aug. 14, 2014	May 15, 2014	Feb. 14, 2014
Distributions per common unit	$ 0.490	$ 0.480	$ 0.475	$ 0.465	$ 0.970	$ 0.925