Product Sales Revenues (Components Of Product Sales Revenues) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Product Sales Revenue [Abstract]
Physical sale of petroleum products		$ 135,459	$ 133,319	$ 266,039	$ 302,566
Change in value of NYMEX contracts		(11,770)	(23,350)	4,212	(19,470)
Total product sales revenue	[1]	$ 123,689	$ 109,969	$ 270,251	$ 283,096

[1] Includes gains (losses) on related NYMEX contracts. See Note 8–Derivative Financial Instruments.