Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Accounts receivable	$ 8,312	$ 18,481
Inventories	47,212	41,169
Employee benefits	37,335	42,191
Accrued expenses and other	71,621	52,635
Deductible state tax and interest benefit	2,904	2,087
Intangibles	16,134	22,119
Federal, foreign and state net operating losses and credits	575,625	530,978
Gross deferred tax assets	759,143	709,660
Valuation allowance	(347,786)	(362,963)
Net deferred tax assets	411,357	346,697
Inventories	(18,332)	(14,423)
Plant and equipment	(477,734)	(397,668)
Intangibles	(181,436)	(170,817)
Other liabilities	(96,134)	(31,702)
Gross deferred tax liabilities	(773,636)	(614,610)
Net deferred tax liability	$ (362,279)	$ (267,913)