Segment Information and Enterprise-Wide Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Reporting Revenue Reconciling [Line Items]
Total sales	$ 227,276	$ 221,014	$ 691,916	$ 604,499
Inter-company sales	(66,699)	(57,894)	(199,978)	(155,379)
Net sales	160,577	163,120	491,938	449,120
Property, plant and equipment	231,863	199,098	231,863	199,098	200,745
Total assets	773,729	822,384	773,729	822,384	846,550
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Asia [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	145,562	133,116	427,132	364,347
Inter-company sales	(25,674)	(15,961)	(64,251)	(38,054)
Net sales	119,888	117,155	362,881	326,293
Property, plant and equipment	167,413	137,604	167,413	137,604
Total assets	485,448	439,303	485,448	439,303
North America [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	34,559	42,769	107,156	112,380
Inter-company sales	(15,111)	(14,898)	(46,321)	(40,094)
Net sales	19,448	27,871	60,835	72,286
Property, plant and equipment	33,562	30,116	33,562	30,116
Total assets	96,995	169,801	96,995	169,801
Europe [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	47,155	45,129	157,628	127,772
Inter-company sales	(25,914)	(27,035)	(89,406)	(77,231)
Net sales	21,241	18,094	68,222	50,541
Property, plant and equipment	30,888	31,378	30,888	31,378
Total assets	191,286	213,280	191,286	213,280
China [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	57,804	49,944	158,370	138,901
Percentage of net sales	36.00%	31.00%	32.00%	31.00%
Taiwan [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	32,171	36,035	106,432	103,841
Percentage of net sales	20.00%	22.00%	22.00%	23.00%
United States [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	22,733	41,641	79,190	103,430
Percentage of net sales	14.00%	26.00%	16.00%	23.00%
Korea [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	9,200	9,681	29,389	26,569
Percentage of net sales	6.00%	6.00%	6.00%	6.00%
Germany [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	7,555	7,260	25,011	24,412
Percentage of net sales	5.00%	4.00%	5.00%	3.00%
Singapore [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	6,744	7,079	18,333	18,448
Percentage of net sales	4.00%	4.00%	4.00%	4.00%
England [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	7,906	6,757	25,134	13,432
Percentage of net sales	5.00%	4.00%	5.00%	5.00%
All Others [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	$ 16,464	$ 4,723	$ 50,079	$ 20,087
Percentage of net sales	10.00%	3.00%	10.00%	4.00%

Revenues From Transactions Within Same Entity

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The net of assets and liabilities.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Amount of total revenue for the reportable segment, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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