Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 11,324	$ 11,922
Credit carryforward	708	782
Accruals	32,352	32,486
Allowance for doubtful accounts	2,068	1,540
Inventories	15,440	7,831
Other	6,666	4,704
Deferred taxes assets, total	68,558	59,265
Property, plant and equipment	(434,561)	(340,237)
Turnaround costs	(26,002)	(10,858)
Other	(478)	(228)
Deferred tax liabilities-total	(461,041)	(351,323)
Valuation allowance	(11,324)	(11,927)
Total net deferred tax liabilities	(403,807)	(303,985)
Balance sheet classifications
Current deferred tax asset	34,169	22,305
Deferred tax liability	(437,976)	(326,290)
Total net deferred tax liabilities	$ (403,807)	$ (303,985)