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Accounts Receivable and Allowances For Doubtful, Accounts, Returns and Discounts (Tables)
 12 Months Ended
Dec. 31, 2011
Accounts Receivable and Allowances for Doubtful Accounts, Returns and Discounts [Abstract]  
Accounts Receivable and Allowances for Doubtful Accounts, Returns and Discounts
                 
    December 31,  
    2011     2010  
    (In thousands)  

Accounts receivable

   $ 118,138     $ 107,549  

Less: allowance for doubtful accounts, returns and discounts

     (8,252 )      (5,897 ) 
   

 

 

    

 

 

  
    $ 109,886     $ 101,652  
   

 

 

    

 

 

  
Summary of activity in allowances for doubtful accounts, returns and discounts

The following is a summary of activity in allowances for doubtful accounts, returns and discounts for the years ended December 31, 2011, 2010 and 2009:

 

                                         
    Balance at
Beginning of
Period		     Charges to
Revenue		     Charges to
Expense		     Deductions
from Reserves		     Balance at End
of Period		  
    (In thousands)  

Year ended December 31,

                                        

2011

   $ 5,897     $ 7,611     $ 615     $ (5,871 )    $ 8,252  

2010

     5,163       3,109       1,056       (3,431 )      5,897  

2009

     8,697       4,794       266       (8,594 )      5,163