Other Assets (Schedule Of Intangible and Other Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Finite-Lived And Indefinite-Lived Intangible Assets [Line Items]
Goodwill, Cost	$ 5,814	$ 5,814
Goodwill, Net	5,814	5,814
Interest Rate Contract, Gross	290	436
Other Assets [Line Items]
Interest rate contract	290	436
Turnaround costs, Cost	154,453	100,020
Turnaround costs, Accumulated Amortization	(65,268)	(67,767)
Turnaround costs, Net	89,185	32,253
Other, Costs	8,723	8,710
Other, Accumulated Amortization	(3,187)	(2,620)
Other, Net	5,536	6,090
Total deferred charges and other assets, Cost	163,466	109,166
Total deferred charges and other assets, Accumulated Amortization	(68,455)	(70,387)
Total deferred charges and other assets, Net	95,011	38,779
Other assets, Cost	169,280	114,980
Other assets, Accumulated Amortization	(68,455)	(70,387)
Total other assets, net	$ 100,825	$ 44,593
Deferred Turnaround Costs [Member]
Other Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Other Amortizable Assets [Member]
Other Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	17 years