Distributions (Schedule Of Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands							6 Months Ended	12 Months Ended
	May. 13, 2016	Feb. 12, 2016	Nov. 13, 2015	Aug. 14, 2015	May. 15, 2015	Feb. 13, 2015	Jun. 30, 2016	Dec. 31, 2015
Per Unit Cash Distribution Amount		$ 0.785	$ 0.7625	$ 0.7400	$ 0.7175	$ 0.6950		$ 2.915
Total Cash Distribution to Limited Partners		$ 178,808	$ 173,413	$ 168,296	$ 163,178	$ 158,061		$ 662,948
Scenario, Forecast
Per Unit Cash Distribution Amount	$ 0.8025						$ 1.5875
Total Cash Distribution to Limited Partners	$ 182,797						$ 361,605