Partners' Capital And Distributions (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Partners Capital And Distributions [Line Items]
Date Paid			Aug. 14, 2015	May 15, 2015	Feb. 13, 2015	Nov. 14, 2014	Aug. 14, 2014	May 15, 2014
Per Unit Amount			$ 0.6250	$ 0.6100	$ 0.5950	$ 0.5800	$ 0.5650	$ 0.5500
Total Amount			$ 68,737	$ 60,774	$ 56,542	$ 54,112	$ 50,114	$ 48,783
Scenario, Forecast
Partners Capital And Distributions [Line Items]
Date Paid		Nov. 13, 2015
Per Unit Amount	[1]	$ 0.6400
Total Amount		$ 70,387

[1] This distribution will be paid to unitholders of record as of October 30, 2015.