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Retirement Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension and other postretirement liabilities $ 92,100,000 $ 66,200,000  
Percentage of change in health care cost trend rate assumptions would be immaterial 1.00%    
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 13 years    
Pension Plan [Member]
      
Defined benefit plan, expect to required contributions 200,000    
Unfunded Non-Qualified Supplemental Pension Plan [Member]
      
Projected benefit obligation to unfunded plan 2,800,000 2,600,000  
Pension expense 100,000 100,000 200,000
Films Manufacturing Facility In Kerkrade [Member] | Multiemployer Plans, Pension [Member]
      
Number of employees participating in pension plan 101    
Multi-employer pension plan, pension expenses $ 500,000 $ 600,000 $ 600,000