Accounts Receivable Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

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

Allowance for Credit Losses on Financing Receivables [Table Text Block]

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