Partners' Capital And Distributions (Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 14, 2016	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Nov. 13, 2015	Aug. 14, 2015	May 15, 2015
Partners Capital And Distributions [Line Items]
Date Paid		Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Nov. 13, 2015	Aug. 14, 2015	May 15, 2015
Per Unit Amount		$ 0.6900	$ 0.6725	$ 0.6550	$ 0.6400	$ 0.6250	$ 0.6100
Total Amount		$ 81,406	$ 73,961	$ 72,036	$ 70,387	$ 68,737	$ 60,774
Scenario, Forecast
Partners Capital And Distributions [Line Items]
Date Paid	Nov. 14, 2016
Per Unit Amount	$ 0.7000
Total Amount	$ 82,585