Income Taxes (Principal Components Of The Company's Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Accruals not yet tax deductible	$ 141,961	$ 129,449
Pension and postretirement benefit plan obligations	88,741	126,952
Stock compensation	19,051	20,111
Net operating loss carryforward	33,587	38,250
Valuation allowance	(30,953)	(20,659)
Other, net	56,903	47,039
Deferred tax assets, net	309,290	341,142
Deferred tax liabilities:
Depreciation, tax in excess of book	(139,268)	(136,340)
Other	(2,293)	(2,419)
Deferred tax liabilities, net	(141,561)	(138,759)
Total	$ 167,729	$ 202,383