Accounts Receivable and Sales Concentrations (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Summary of Accounts Receivables

	December 31,
	2016		2015
Trade	$	140,754	$	124,226
Less—allowance for doubtful accounts		1,207		1,221
Accounts receivable, net	$	139,547	$	123,005

Summary of Activity in the Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts is as follows:

	Balance at
	Beginning				Write-			Currency			Balance at
Description	of Year		Additions		offs			Impacts			End of Year
December 31, 2016
Allowance for doubtful accounts	$	1,221	$	142	$	(75	)	$	(81	)	$	1,207
December 31, 2015
Allowance for doubtful accounts	$	520	$	745	$	(8	)	$	(36	)	$	1,221
December 31, 2014
Allowance for doubtful accounts	$	445	$	208	$	(123	)	$	(10	)	$	520