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Allowance for Doubtful Accounts, Sales Returns and Discounts (Tables)
 12 Months Ended
Dec. 31, 2012
Allowance For Doubtful Accounts Sales Returns and Discounts [Abstract]  
Schedule Of Allowance For Doubtul Accounts Activity [Table Text Block]

Allowance for doubtful accounts

 

Period  

Balance at

beginning

of year

    

Charges
(credits) to

earnings

    

 

Amounts
utilized

    

Balance at

end of
year

  
    (in thousands)  
                         
Year 2010   $ 25,515       (8,788 )     -       16,727  
Year 2011   $ 16,727       (1,541 )     -       15,186  
Year 2012   $ 15,186       -       -       15,186  
Schedule Of Allowance For Sales Returns and Discounts Activity [Table Text Block]

Allowance for sales returns and discounts

 

Period  

Balance at

beginning
of year

     Additions    

 

Amounts
utilized

    

Balance at

end of
year

  
    (in thousands)  
                         
Year 2010   $ 970       4,551       (4,930 )     591  
Year 2011   $ 591       3,385       (3,191 )     785  
Year 2012   $ 785       7,386       (7,093 )     1,078