Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Accounts receivable	$ 23,521	$ 11,134
Inventories	48,673	42,558
Employee benefits	76,143	70,989
Accrued expenses and other	72,258	54,652
Deductible state tax and interest benefit	5,186	491
Intangibles	12,874	34,003
Federal, foreign and state net operating losses and credits	456,130	458,743
Gross deferred tax assets	694,785	672,570
Valuation allowance	(289,078)	(287,580)
Net deferred tax assets	405,707	384,990
Inventories	(13,099)	(8,663)
Plant and equipment	(426,087)	(429,258)
Intangibles	(243,339)	(267,571)
Other liabilities	(50,041)	(30,256)
Gross deferred tax liabilities	(732,566)	(735,748)
Net deferred tax liability	$ (326,859)	$ (350,758)