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Commitments And Contingencies (Environmental) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Site Contingency [Line Items]      
Total accruals for environmental remediation $ 21,700,000 $ 22,500,000  
Accrual for dismantling and decommissioning costs 600,000 500,000  
Payment of environmental operating and clean up costs 19,000,000 18,000,000 17,000,000
Capital expenditures for pollution prevention and safety projects 9,000,000 7,000,000 5,000,000
TEL Site, Louisiana [Member]
      
Site Contingency [Line Items]      
Accruals for environmental remediation 6,100,000 6,800,000  
Accruals for environmental remediation, discount rate 3.00% 3.00%  
Undiscounted liability 7,700,000 8,700,000  
2012 expected payments 600,000    
2013 expected payments 600,000    
2014 expected payments 600,000    
2015 expected payments 600,000    
2016 expected payments 600,000    
Expected payments thereafter 4,700,000    
Houston, Texas, Plant Site [Member]
      
Site Contingency [Line Items]      
Accruals for environmental remediation, dismantling, and decontamination 7,400,000 7,600,000  
Accruals for environmental remediation 7,000,000 7,300,000  
Remediation of groundwater and soil 6,500,000 6,900,000  
Accruals for environmental remediation, discount rate 3.00% 3.00%  
Undiscounted liability 10,200,000 10,800,000  
2012 expected payments 1,000,000    
2013 expected payments 500,000    
2014 expected payments 1,600,000    
2015 expected payments 200,000    
2016 expected payments 200,000    
Expected payments thereafter 6,700,000    
Superfund Site, Louisiana [Member]
      
Site Contingency [Line Items]      
Accruals for environmental remediation 3,100,000 3,300,000  
Accruals for environmental remediation, discount rate 3.00% 3.00%  
Undiscounted liability 4,000,000 4,200,000  
2012 expected payments 300,000    
2013 expected payments 200,000    
2014 expected payments 200,000    
2015 expected payments 300,000    
2016 expected payments 300,000    
Expected payments thereafter $ 2,700,000