Segment Information and Enterprise-Wide Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Segment Reporting Revenue Reconciling [Line Items]
Total sales	$ 198,048	$ 215,691
Inter-company sales	(53,385)	(54,136)
Net sales	144,663	161,555
Property, plant and equipment	227,328	207,336	225,393
Total assets	847,808	881,798	793,064
Percentage of net sales	100.00%	100.00%
Asia [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	127,371	131,555
Inter-company sales	(16,368)	(14,449)
Net sales	111,003	117,106
Property, plant and equipment	165,929	142,228
Total assets	507,538	471,105
North America [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	31,732	35,373
Inter-company sales	(15,164)	(15,332)
Net sales	16,568	20,041
Property, plant and equipment	32,113	34,572
Total assets	118,657	183,841
Europe [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	38,945	48,763
Inter-company sales	(21,853)	(24,355)
Net sales	17,092	24,408
Property, plant and equipment	29,286	30,536
Total assets	221,613	226,852
China [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	49,152	47,436
Percentage of net sales	34.00%	29.00%
Taiwan [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	31,781	37,680
Percentage of net sales	22.00%	23.00%
United States [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	28,270	26,529
Percentage of net sales	20.00%	17.00%
Korea [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	10,221	9,767
Percentage of net sales	7.00%	6.00%
Germany [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	6,782	9,457
Percentage of net sales	5.00%	6.00%
Singapore [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	4,645	5,562
Percentage of net sales	3.00%	3.00%
England [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	5,125	8,718
Percentage of net sales	3.00%	6.00%
All Others [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	$ 8,687	$ 16,406
Percentage of net sales	6.00%	10.00%