Product Sales Revenues (Components Of Product Sales Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Product Sales Revenue [Line Items]
Physical sale of petroleum products	$ 100,829	$ 108,320	$ 403,395	$ 555,870
NYMEX Adjustments Included in Product Sales	71,902	47,545	52,432	33,715
Sales Revenue from Energy Commodities and Services	172,731	155,865	455,827	589,585
Other Product Sale Revenue [Member]
Product Sales Revenue [Line Items]
NYMEX Adjustments Included in Product Sales	0	(1)	0	12
Butane Blending And Fractionation Activities [Member]
Product Sales Revenue [Line Items]
NYMEX Adjustments Included in Product Sales	$ 71,902	$ 47,546	$ 52,432	$ 33,703