Segment Information and Enterprise-Wide Disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Revenue Reconciling [Line Items]
Total sales	$ 267,699	$ 227,879
Inter-company sales	(57,713)	(50,915)
Net sales	209,986	176,964
Property, plant and equipment	315,817	338,173	322,013
Total assets	1,140,604	1,144,638	1,162,258
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	190,556	155,434
Inter-company sales	(23,285)	(16,024)
Net sales	167,271	139,410
Property, plant and equipment	264,038	283,840
Total assets	843,435	820,553
North America [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	35,597	34,808
Inter-company sales	(14,737)	(15,401)
Net sales	20,860	19,407
Property, plant and equipment	29,011	31,352
Total assets	121,094	142,025
Europe [Member]
Segment Reporting Revenue Reconciling [Line Items]
Total sales	41,546	37,637
Inter-company sales	(19,691)	(19,490)
Net sales	21,855	18,147
Property, plant and equipment	22,768	22,981
Total assets	176,075	182,060
China [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	127,458	107,644
Percentage of net sales	61.00%	61.00%
Taiwan [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	6,883	5,153
Percentage of net sales	3.00%	3.00%
United States [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	19,641	17,416
Percentage of net sales	9.00%	10.00%
Korea [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	20,125	15,447
Percentage of net sales	10.00%	9.00%
Germany [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	14,827	11,028
Percentage of net sales	7.00%	6.00%
Singapore [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	9,618	8,935
Percentage of net sales	5.00%	5.00%
All Others [Member]
Segment Reporting Revenue Reconciling [Line Items]
Net sales	$ 11,434	$ 11,341
Percentage of net sales	5.00%	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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