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Savings, Pension and Other Postretirement Employee Benefit Plans Multiemployer Defined Benefit Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Multiemployer Plans, Withdrawal Obligation   $ 72,000,000  
Entity Tax Identification Number 516031295    
Contributions (in thousands) 6,061,000 5,961,000 5,917,000
IAM
     
Defined Benefit Plan Disclosure [Line Items]      
Multiemployer Plan Number 002    
Multiemployer Plans, Certified Zone Status Green Green  
Contributions (in thousands) 343,000 288,000 269,000
Multiemployer Plans, Surcharge No    
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date May 31, 2016    
USW
     
Defined Benefit Plan Disclosure [Line Items]      
Entity Tax Identification Number 116166763    
Multiemployer Plan Number 001    
Multiemployer Plans, Certified Zone Status Red Red  
Contributions (in thousands) $ 5,718,000 $ 5,673,000 $ 5,648,000
Multiemployer Plans, Surcharge No    
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date Aug. 31, 2014