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Accounts Receivable, net (Tables)
3 Months Ended
Mar. 31, 2012
Accounts Receivable, net [Abstract]  
Net Accounts Receivables
                 
    March 31,
2012
    December 31,
2011
 
    (In Thousands)  

Trade receivables

  $ 87,475     $ 87,303  

Other

    965       1,003  
   

 

 

   

 

 

 
      88,440       88,306  

Allowance for doubtful accounts

    (916     (955
   

 

 

   

 

 

 
    $ 87,524     $ 87,351