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Accounts Receivable, net (Tables)
12 Months Ended
Dec. 31, 2011
Accounts Receivable, net [Abstract]  
Net Accounts Receivables
                 
    December 31,  
    2011     2010  
    (In Thousands)  
Trade receivables
  $ 87,303     $ 73,367  
Other
    1,003       1,528  
 
           
 
    88,306       74,895  
Allowance for doubtful accounts
    (955 )     (636 )
 
           
 
  $ 87,351     $ 74,259