Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2011

Shareholders' Equity [Abstract]

Employee Stock-Based Compensation Expense Included In The Consolidated Statements Of Income

	Three Months Ended						Nine Months Ended
	September 30, 2011			October 1, 2010			September 2011			October 1, 2010
(Dollars in thousands)
Cost of sales	$	491		$	485		$	1,461		$	1,472
Research and development		1,151			968			3,373			2,899
Sales and marketing		1,672			1,283			4,966			4,013
General and administrative		3,791			2,804			11,233			7,781
Total operating expenses		6,614			5,055			19,572			14,693
Total stock-based compensation expense		7,105			5,540			21,033			16,165
Tax benefit (1)		(1,782	)		(1,150	)		(6,124	)		(3,345	)
Total stock-based compensation expense, net of tax	$	5,323		$	4,390		$	14,909		$	12,820

(1) Tax benefit related to U.S. non-qualified options, restricted stock units, and disqualified disposition of incentive stock options, applying a Federal statutory and State (Federal effected) tax rate for the respective periods.

Weighted Average Assumptions Used In Stock Options Granted

	Three Months Ended						Nine Months Ended
	September 30, 2011			October 1, 2010			September 30, 2011			October 1, 2010
Expected dividend yield		—			—			—			—
Expected stock price volatility		43.6	%		43.8	%		43.6	%		43.7	%
Risk free interest rate		1.6	%		1.7	%		1.6	%		1.8	%
Expected life of option		4.2 years			4.1 years			4.2 years			4.2 years