Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Sales to external clients:
Total sales to external clients	$ 110,838	$ 112,298	$ 339,850	$ 332,861
Operating segment income (loss):
Operating income (loss)	(1,496)	8,237	(4,140)	20,812
Interest expense, net	(860)	(1,208)	(2,594)	(3,729)
Income (loss) before income taxes	(2,356)	7,029	(6,734)	17,083
Americas [Member]
Sales to external clients:
Total sales to external clients	91,793	95,213	282,337	284,262
Operating segment income (loss):
Operating income (loss)	9,235	14,936	27,703	40,383
Europe [Member]
Sales to external clients:
Total sales to external clients	19,617	18,328	63,206	53,663
Operating segment income (loss):
Operating income (loss)	(1,658)	1,157	249	4,160
Asia Pacific [Member]
Sales to external clients:
Total sales to external clients	10,457	8,451	28,887	23,852
Operating segment income (loss):
Operating income (loss)	668	1,533	1,610	2,941
Intercompany sales elimination [Member]
Sales to external clients:
Total sales to external clients	(11,029)	(9,694)	(34,580)	(28,916)
Corporate [Member]
Operating segment income (loss):
Operating income (loss)	$ (9,741)	$ (9,389)	$ (33,702)	$ (26,672)