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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Column A   Column B     Column C     Column D     Column E  
          Additions              
          (1)     (2)              
                Charged to              
    Balance at     Charged to     other              
    beginning of     costs and     accounts -     Deductions -     Balance at  
Description   period     expenses     describe     describe     end of period  
Allowance for doubtful accounts:                                        
Year ended December 31, 2013   $ 6,074       574       123 (d)     4,238 (a)     2,533  
Year ended December 31, 2012   $ 5,320       914       120 (d)     280 (a)     6,074  
Year ended December 31, 2011   $ 4,367       2,838       (211 )(d)     1,674 (a)     5,320  
                                         
Sales return accrual:                                        
Year ended December 31, 2013   $ 4,526       3,751       -       4,434 (b)     3,843  
Year ended December 31, 2012   $ 4,172       4,249       -       3,895 (b)     4,526  
Year ended December 31, 2011   $ 1,560       4,129       -       1,517 (b)     4,172  
                                         
Inventory Reserve:                                        
Year ended December 31, 2013   $ 19,923       6,794       323 (d)     20,249 (c)     6,791  
Year ended December 31, 2012   $ 7,460       17,957       449 (d)     5,943 (c)     19,923  
Year ended December 31, 2011   $ 6,242       3,880       (272 )(d)     2,390 (c)     7,460  

 

(a) Write-off of bad debts.

(b) Write-off of sales returns.

(c) Disposal of inventory

(d) Foreign currency translation adjustment