Income Taxes (Principal Components Of The Company's Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accruals not yet tax deductible	$ 108,284	$ 92,158
Pension and postretirement benefit plan obligations	48,347	37,357
Stock compensation	13,295	12,669
Net operating loss carryforward	34,842	33,171
Valuation allowance	(21,868)	(21,561)
Other, net	43,870	52,422
Deferred tax assets, net	226,770	206,216
Deferred tax liabilities:
Depreciation, tax in excess of book	(79,326)	(88,989)
Other	(5,980)	(8,154)
Deferred tax liabilities, net	(85,306)	(97,143)
Total	$ 141,464	$ 109,073