Segment Information and Enterprise-wide Disclosures (Revenue by Customer locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES	$ 143,313	$ 160,577	$ 169,806	$ 161,555	$ 163,767	$ 163,120	$ 149,153	$ 136,847	$ 635,251	$ 612,886	$ 434,357
Sales Revenue Net Percentage									100.00%	100.00%	100.00%
China [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									206,965	187,633	131,914
Sales Revenue Net Percentage									32.00%	31.00%	30.00%
Taiwan [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									136,129	141,388	122,502
Sales Revenue Net Percentage									21.00%	23.00%	28.00%
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									105,588	134,911	75,185
Sales Revenue Net Percentage									17.00%	22.00%	17.00%
Korea [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									37,643	35,180	27,223
Sales Revenue Net Percentage									6.00%	6.00%	6.00%
Germany [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									30,838	31,704	17,438
Sales Revenue Net Percentage									5.00%	5.00%	4.00%
Singapore [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									23,492	24,468	14,429
Sales Revenue Net Percentage									4.00%	4.00%	4.00%
UK [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									30,065	24,337	17,926
Sales Revenue Net Percentage									5.00%	4.00%	4.00%
All Others [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
NET SALES									$ 64,531	$ 33,265	$ 27,740
Sales Revenue Net Percentage									10.00%	5.00%	7.00%