Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, current	$ 15,944us-gaap_DeferredTaxAssetsGrossCurrent	$ 20,565us-gaap_DeferredTaxAssetsGrossCurrent
Deferred tax assets, noncurrent	70,353	101,116
Deferred tax assets, gross	86,297us-gaap_DeferredTaxAssetsGross	121,681us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities, current	(33,353)	(244,564)
Deferred tax liabilities, noncurrent	(717,223)	(717,958)
Deferred tax liabilities, gross	(750,576)us-gaap_DeferredIncomeTaxLiabilities	(962,522)us-gaap_DeferredIncomeTaxLiabilities
Deferred taxes, net, current	(17,409)	(223,999)
Deferred taxes, net, noncurrent	(646,870)	(616,842)
Deferred taxes, net	(664,279)us-gaap_DeferredTaxAssetsLiabilitiesNet	(840,841)us-gaap_DeferredTaxAssetsLiabilitiesNet
Accrued employee benefits
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, current	6,854	3,138
Deferred tax assets, noncurrent	16,120	41,997
Deferred taxes, net, current	6,854	3,138
Deferred taxes, net, noncurrent	16,120	41,997
Reserve for Environmental Costs [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, current	5,930	5,010
Deferred tax assets, noncurrent	24,814	20,431
Deferred taxes, net, current	5,930	5,010
Deferred taxes, net, noncurrent	24,814	20,431
Deferred Tax Asset, Derivatives [Domain]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, current		12,417
Deferred tax assets, noncurrent	9,584	3,744
Deferred taxes, net, current		12,417
Deferred taxes, net, noncurrent	9,584	3,744
Deferred Tax Liability Derivatives [Domain]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, current	(21,185)
Deferred taxes, net, current	(21,185)
Inventory differences
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, current	(7,375)	(235,823)
Deferred taxes, net, current	(7,375)	(235,823)
Prepayments and other
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, current	(4,793)	(7,222)
Deferred taxes, net, current	(4,793)	(7,222)
Other Current Assets [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, current	3,160
Deferred tax liabilities, current		(1,519)
Deferred taxes, net, current	3,160	(1,519)
Property, Plant and Equipment [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(581,017)	(578,958)
Deferred taxes, net, noncurrent	(581,017)	(578,958)
Deferred turnaround costs
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(110,827)	(101,158)
Deferred taxes, net, noncurrent	(110,827)	(101,158)
Postretirement Benefit Costs [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	9,716
Deferred tax liabilities, noncurrent		(8,071)
Deferred taxes, net, noncurrent	9,716	(8,071)
Net operating loss and tax credit carryforwards
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent	10,119	24,086
Deferred taxes, net, noncurrent	10,119	24,086
Variable Interest Entity, Primary Beneficiary [Member]
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax liabilities, noncurrent	(25,244)	(29,771)
Deferred taxes, net, noncurrent	(25,244)	(29,771)
Other
Deferred Income Taxes Assets Liabilities [Line Items]
Deferred tax assets, noncurrent		10,858
Deferred tax liabilities, noncurrent	(135)
Deferred taxes, net, noncurrent	$ (135)	$ 10,858

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Amount of deferred tax liability attributable to taxable temporary differences.

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