Partners' Capital and Distributions (New Common Units Issued To The Public For Cash) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands					1 Months Ended
	Jul. 27, 2016	Jul. 22, 2015	Apr. 10, 2015	Sep. 26, 2014	Jul. 31, 2015
Partners' Capital Notes [Abstract]
Units (in shares)	8,000	10,350	4,600	4,600
Gross Unit Price (in dollars per share)	$ 37.90	$ 43.77	$ 44.42	$ 50.71
Issuance Value	$ 303,200	$ 453,020	$ 204,332	$ 233,266
Costs	(4,748)	(15,856)	(6,164)	(7,541)
Net Proceeds	$ 298,452	$ 437,164	$ 198,168	$ 225,725	$ 437,200