Equity and Distributions, Distributions (Details) (USD $)	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Mar. 31, 2013 Cash Distribution [Member] First Quarter 2013 Distribution [Member]	Sep. 30, 2013 Cash Distribution [Member] First Quarter 2013 Distribution [Member]	Jun. 30, 2013 Cash Distribution [Member] Second Quarter 2013 Distribution [Member]	Sep. 30, 2013 Cash Distribution [Member] Second Quarter 2013 Distribution [Member]	Sep. 30, 2013 Cash Distribution [Member] Third Quarter 2013 Distribution [Member]	Sep. 30, 2013 Cash Distribution [Member] Third Quarter 2013 Distribution [Member]
Distributions to Partners [Abstract]
Distribution Per Common Unit (in dollars per unit)		$ 0.67		$ 0.68		$ 0.69
Record Date			Apr. 30, 2013		Jul. 31, 2013		Oct. 31, 2013
Payment Date			May 07, 2013		Aug. 07, 2013		Nov. 07, 2013
Number of Designated Units to be excluded from distributions during 2013	23,700,000
Number of Designated Units to be excluded from distributions during 2014	22,560,000
Number of Designated Units to be excluded from distributions during 2015	17,690,000