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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Pension And Other Postretirement Benefit Plans [Abstract]  
Components Of Net Periodic Cost
     Three Months Ended March 31,  
(in thousands)    Pension Benefits     Other
Postretirement
Benefits		  
   2012     2011     2012     2011  

Service cost

    $ 3,495      $ 2,976      $ 29      $ 115   

Interest cost

      9,334        9,127        127        603   

Expected return on plan assets

      (12,830 )      (11,807 )      —          —     

Amortization of prior service cost

      100        102        (59 )      (102 ) 

Amortization of net loss (gain)

      4,843        1,978        (21 )      (243 ) 

Settlements

      (27 )      —          —          —     
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic cost

    $ 4,915      $ 2,376      $ 76      $ 373