Accounts Receivable and Sales Concentrations (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Receivable and Sales Concentrations/Long Term Note Receivable [Abstract]

Summary of accounts receivables

	December 31,
	2012		2011
Trade	$	51,939	$	67,145
Less—allowance for doubtful accounts		311		438
Accounts receivable, net	$	51,628	$	66,707

Summary of Activity in the allowance for doubtful accounts

Description	Balance at Beginning of Year		Additions		Write- offs			Currency Impacts			Balance at End of Year
December 31, 2012
Allowance for doubtful accounts	$	438	$	98	$	(224	)	$	(1	)	$	311
December 31, 2011
Allowance for doubtful accounts	$	478	$	140	$	(178	)	$	(2	)	$	438
December 31, 2010
Allowance for doubtful accounts	$	473	$	97	$	(81	)	$	(11	)	$	478