Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Accounts receivable	$ 7,063	$ 8,312
Inventories	50,585	47,212
Employee benefits	36,068	37,335
Accrued expenses and other	67,638	71,621
Deductible state tax and interest benefit	3,665	2,904
Intangibles	146,953	16,134
Lease liabilities	86,717
Federal, foreign and state net operating losses and credits	376,375	575,625
Gross deferred tax assets	775,064	759,143
Valuation allowance	(232,196)	(347,786)
Net deferred tax assets	542,868	411,357
Inventories	(12,885)	(18,332)
Plant and equipment	(510,952)	(477,734)
Intangibles	(182,424)	(181,436)
Right of use assets	(83,271)
Other liabilities	(24,220)	(96,134)
Gross deferred tax liabilities	(813,752)	(773,636)
Net deferred tax liability	$ (270,884)	$ (362,279)