Partners' Capital And Distributions (Distributions) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Distribution Made to Limited Partner, Distribution Date	Nov. 14, 2013	Aug. 14, 2013	May 15, 2013	Feb. 14, 2013	Nov. 14, 2012	Aug. 14, 2012	May 15, 2012
Per Unit Amount	$ 0.5225	$ 0.5100	$ 0.4975	$ 0.4850	$ 0.4725	$ 0.4600	$ 0.4500
Distribution Made to Limited Partner, Cash Distributions Paid	$ 46,344	$ 42,302	$ 40,405	$ 39,390	$ 38,375	$ 36,563	$ 35,768