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Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2012
Comprehensive Income [Abstract]  
Comprehensive Income
                 
    Six months Ended June 30,  
    2012     2011  
    (in thousands)  

Net income

  $ 314,873     $ 278,327  

Other comprehensive income:

               

Foreign currency translation

    3,925       26,363  

Pension and other post-retirement benefit adjustments:

               

Recognition of prior service credit, net of tax

    (2,474     (2,519

Recognition of actuarial loss, net of tax

    22,143       16,028  
   

 

 

   

 

 

 

Total other comprehensive income

    23,594       39,872  
   

 

 

   

 

 

 

Comprehensive income

  $ 338,467     $ 318,199