Partners' Capital And Distributions (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Partners Capital And Distributions [Line Items]
Distribution Made to Limited Partner, Distribution Date	May 15, 2015		Feb. 13, 2015	Nov. 14, 2014	Aug. 14, 2014	May 15, 2014
Per Unit Amount	$ 0.6100	[1]	$ 0.5950	$ 0.5800	$ 0.5650	$ 0.5500
Distribution Made to Limited Partner, Cash Distributions Paid	$ 60,774		$ 56,542	$ 54,112	$ 50,114	$ 48,783
August 14, 2015 [Member]
Partners Capital And Distributions [Line Items]
Distribution Made to Limited Partner, Distribution Date	Aug. 14, 2015
Per Unit Amount	$ 0.6250
Distribution Made to Limited Partner, Cash Distributions Paid	$ 68,737

[1] This distribution will be paid to unitholders of record as of July 31, 2015.