Retirement Plans And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, accumulated benefit obligation	$ 162,600	$ 147,600
Defined Benefit Plan, Plan Assets, Amount	$ 126,812	115,199
Employee basic contribution percent	5.00%
Employee supplemental contribution percent	45.00%
Pension and other postretirement benefit contributions	$ 2,100	1,300	$ 1,600
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	834	726
Defined Benefit Plan, Plan Assets, Amount	$ 18,980	$ 15,354	$ 13,618