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Retirement Plans And Other Postretirement Benefits (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement liabilities $ 98,837 $ 95,370  
Percentage of change in health care cost trend rate assumptions would be immaterial 1.00%    
Expected pension expense for next twelve months $ 10,200    
Term of estimated benefit payments for fixed income securities, minimum 1 year    
Term of estimated benefit payments for fixed income securities, maximum 2 years    
Defined benefit, average remaining duration of benefit payments for pension plans 11 years 3 months 20 days    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expect to required contributions $ 5,300    
Unfunded Non-Qualified Supplemental Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation to unfunded plan 2,200 2,200  
Pension Cost (Reversal of Cost) $ 100 100 $ 100
Films Manufacturing Facility In Kerkrade | Multiemployer Plans, Pension      
Defined Benefit Plan Disclosure [Line Items]      
Number of employees participating in pension plan | employee 70    
Multi-employer pension plan, pension expenses $ 400 400 400
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Prior service cost (benefit) 5    
Projected benefit obligation to unfunded plan 318,123 303,126 303,852
Multi-employer pension plan, pension expenses $ 10,134 $ 10,886 $ 12,346