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Retirement Plans And Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation $ 147,600 $ 158,600  
Defined Benefit Plan, Plan Assets, Amount $ 115,199 123,463  
Employee basic contribution percent 5.00%    
Employee supplemental contribution percent 45.00%    
Pension and other postretirement benefit contributions $ 1,300 1,600 $ 2,500
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 5,579 6,673  
Defined Benefit Plan, Plan Assets, Amount 99,845 109,845 100,905
U.S. [Member] | Postretirement Benefit Costs [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 532 790  
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 726 658  
Defined Benefit Plan, Plan Assets, Amount 15,354 13,618 11,871
Foreign [Member] | Postretirement Benefit Costs [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 926 856  
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0 $ 0