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Accounts Receivable Accounts Receivable
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Accounts receivable

Accounts receivable consist of the following at December 31, 2013 and 2012:
 
2013
 
2012
Trade receivables
$
115,876

 
$
94,962

Allowance for doubtful accounts
(2,707
)
 
(3,095
)
Allowance for sales returns and discounts
(1,884
)
 
(1,570
)
 
$
111,285

 
$
90,297



The following table shows the changes in our allowance for doubtful accounts:
 
2013
 
2012
 
2011
Balance at January 1
$
3,095

 
$
2,669

 
$
4,826

Additions charged to expense
1,051

 
2,333

 
1,753

Deductions (write-offs)
(1,439
)
 
(1,907
)
 
(3,910
)
Balance at December 31
$
2,707

 
$
3,095

 
$
2,669



Recoveries of amounts previously written off were $1,785, $3,402 and $9,084 for the years ended December 31, 2013, 2012 and 2011, respectively.