Partners' Capital And Distributions (Distributions) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	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	Feb. 13, 2015		Nov. 14, 2014	Aug. 14, 2014	May 15, 2014
Per Unit Amount	$ 0.5950		$ 0.5800	$ 0.5650	$ 0.5500
Distribution Made to Limited Partner, Cash Distributions Paid	$ 56,542		$ 54,112	$ 50,114	$ 48,783
May 15, 2015 [Member]
Partners Capital And Distributions [Line Items]
Distribution Made to Limited Partner, Distribution Date	May 15, 2015
Per Unit Amount	$ 0.6100	[1]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 60,774	[2]

[1] (1) This distribution will be paid to unitholders of record as of May 1, 2015.

[2] (2) Includes holders of units issued on April 10, 2015.