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Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2012
Comprehensive Income [Abstract]  
Comprehensive Income
                 
    Three months Ended March 31,  
    2012     2011  
    (in thousands)  

Net income

  $ 146,255     $ 126,515  

Other comprehensive income:

               

Foreign currency translation

    18,677       21,575  

Pension and other post-retirement benefit adjustments:

               

Recognition of prior service credit, net of tax

    (1,239     (1,256

Recognition of actuarial loss, net of tax

    11,081       8,004  
   

 

 

   

 

 

 

Total other comprehensive income

    28,519       28,323  
   

 

 

   

 

 

 

Comprehensive income

  $ 174,774     $ 154,838