Employee Benefit Plans (Narratives) (Details) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 GBP (£)	Dec. 31, 2011 US [Member]	Dec. 31, 2011 China [Member]	Dec. 31, 2011 Taiwan [Member]	Dec. 31, 2011 Years 2009 To 2011 [Member] USD ($)	Dec. 31, 2011 Years 2009 To 2011 [Member] GBP (£)	Dec. 31, 2011 Years 2012 To 2019 [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	$ (10.0)
Defined Benefit Plan Recognized Gain Loss Increase Decrease	(3.0)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(1.0)
Defined Benefit Plan Amortization Of Net Gains Losses Average Term	13 years
Estimated Future Pension Benefit Payments [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments								1.6	1.0
Foreign Currency Exchange Rate, Translation				0.625
Defined Benefit Plan, Estimated Future Benefit Payments Description								The Company adopted a payment plan that Zetex had in place with the trustees of the defined benefit plan, in which the Company paid approximately ₤1 million GBP (approximately $1.6 million based on a USD:GBP exchange rate of 1.6:1) every year from 2009 through 2011	The Company adopted a payment plan that Zetex had in place with the trustees of the defined benefit plan, in which the Company paid approximately ₤1 million GBP (approximately $1.6 million based on a USD:GBP exchange rate of 1.6:1) every year from 2009 through 2011	The Company and the trustees are in discussions to extend the payment scheme through 2019
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	48.00%
Defined Benefit Plan Target Allocation Percentage Of Assets Corporate Bonds And Government Securities	40.00%
Defined Benefit Plan Target Allocation Percentage Of Assets Equity Absolute Return Funds	12.00%
401 (k) Retirement Plan [Abstract]
Description of Defined Contribution Pension and Other Postretirement Plans					The Company maintains a 401(k) retirement plan (the Plan) for the benefit of qualified employees at its U.S. locations. Employees who participate may elect to make salary deferral contributions to the Plan up to 100% of the employees’ eligible payroll subject to annual Internal Revenue Code maximum limitations. The Company makes a matching contribution of $1 for every $2 contributed by the participant up to 6% (3% maximum matching) of the participant’s eligible payroll, which vests over four years. In addition, the Company may make a discretionary contribution to the entire qualified employee pool, in accordance with the Plan.	As stipulated by the regulations of China, the Company maintains a retirement plan pursuant to the local municipal government for the employees in China. The Company is required to make contributions to the retirement plan at a rate between 10% and 22% of the employee’s eligible payroll.	Pursuant to the Taiwan Labor Standard Law and Factory Law, the Company maintains a retirement plan for the employees in Taiwan, whereby the Company makes contributions at a rate of 6% of the employee’s eligible payroll
Defined Contribution Plan, Cost Recognized	5.0	4.0	2.0
Deferred Compensation Plan [Abstract]
Deferred Compensation Arrangements, Overall, Description	The Company maintains a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors (the “Board”). The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. The Company offsets its obligations under the Deferred Compensation Plan by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value.
Deferred Compensation Plan Assets	$ 3.0
Share-based Compensation Arrangement by Share-based Payment Award, Description	The Company maintains share-based compensation plans for its Board, officers and key employees, which provide for stock options and stock awards under its 1993 ISO Plan, 1993 NQO Plan and 2001 Omnibus Equity Incentive Plan