Segment Information and Enterprise-Wide Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Revenue Reconciling [Line Items]
Total sales	$ 227,879	$ 198,048
Inter-company sales	(50,915)	(53,385)
Net sales	176,964	144,663
Property, plant and equipment	338,173		243,296
Total assets	1,144,638		920,063
Percentage of net sales	100.00%	100.00%
Segment Reporting, Factors Used to Identify Entity's Reportable Segments	For financial reporting purposes, the Company operates in a single segment, standard semiconductor products, through the Company’s various manufacturing and distribution facilities. The Company aggregates its products because the products are similar and have similar economic characteristics, and the products are similar in production process and share the same customer type.
Asia [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	155,434	127,371
Inter-company sales	(16,024)	(16,368)
Net sales	139,410	111,003
Property, plant and equipment	283,840	165,929
Total assets	820,553	507,538
North America [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	34,808	31,732
Inter-company sales	(15,401)	(15,164)
Net sales	19,407	16,568
Property, plant and equipment	31,352	32,113
Total assets	142,025	118,657
Europe [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	37,637	38,945
Inter-company sales	(19,490)	(21,853)
Net sales	18,147	17,092
Property, plant and equipment	22,981	29,286
Total assets	182,060	221,613
China [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	58,383	49,152
Percentage of net sales	33.00%	34.00%
Taiwan [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	32,274	31,781
Percentage of net sales	18.00%	22.00%
United States [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	12,950	14,757
Percentage of net sales	7.00%	10.00%
Korea [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	15,762	10,221
Percentage of net sales	9.00%	7.00%
Switzerland [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	14,987	13,513
Percentage of net sales	9.00%	9.00%
Germany [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	8,333	6,782
Percentage of net sales	5.00%	5.00%
Singapore [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	9,466	4,645
Percentage of net sales	5.00%	3.00%
England [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	8,572	5,125
Percentage of net sales	5.00%	4.00%
All Others [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	$ 16,237	$ 8,687
Percentage of net sales	9.00%	6.00%

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Revenue percentage by country derived from billed to customer location.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Description of the factors used to identify reportable segments, including the basis of organization (for example, whether management has chosen to organize the enterprise around differences in products and services, geographic areas, regulatory environments, or a combination of factors and whether operating segments have been aggregated to reportable segments).

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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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 segments, 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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