Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent		$ 0
Deferred tax assets, gross	$ 281,852	75,340
Deferred tax liabilities, gross	(779,758)	(739,619)
Deferred taxes, net	(497,906)	(664,279)
Accrued employee benefits
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	22,355	22,973
Reserve for Environmental Costs [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	42,517	30,744
Deferred Tax Asset, Derivatives [Domain]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	21,815
Deferred Tax Liability Derivatives [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent		(11,601)
Inventory Valuation Reserve [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	175,614
Deferred tax liabilities, noncurrent		(7,376)
Property, Plant and Equipment [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(648,542)	(581,017)
Deferred turnaround costs
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(104,944)	(110,827)
Valuation Allowance, Other Tax Carryforward [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	8,033	10,119
Postretirement Benefit Costs [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	11,518	11,504
Deferred tax liabilities, noncurrent		0
Variable Interest Entity, Primary Beneficiary [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(23,429)	(25,244)
Other
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent		0
Deferred tax liabilities, noncurrent	$ (2,843)	$ (3,554)