Partners' Capital And Distributions (Distributions) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013
Partners Capital And Distributions [Line Items]
Distribution Made to Limited Partner, Distribution Date	Aug. 14, 2014	May 15, 2014	Feb. 14, 2014	Nov. 14, 2013	Aug. 14, 2013	May 15, 2013
Per Unit Amount	$ 0.5650	$ 0.5500	$ 0.5350	$ 0.5225	$ 0.5100	$ 0.4975
Distribution Made to Limited Partner, Cash Distributions Paid	$ 50,114	$ 48,783	$ 47,453	$ 46,344	$ 42,302	$ 40,405
November 14, 2014 [Domain]
Partners Capital And Distributions [Line Items]
Distribution Made to Limited Partner, Distribution Date	Nov. 14, 2014
Per Unit Amount	$ 0.5800
Distribution Made to Limited Partner, Cash Distributions Paid	$ 54,112