Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Information Related to Stock-Based Compensation Plans

The following table sets forth certain information regarding the 1995 Plan and the 1995 Supplemental Plan:

	December 31, 2011
Shares available for grant	2,331,311
Shares of common stock reserved for issuance	4,112,919

Schedule of Options Outstanding and Exercisable [Table Text Block]

The following table sets forth certain information regarding all options outstanding and exercisable:

	December 31, 2011
	Options Outstanding		Options Exercisable
Number	924,028		314,984
Weighted average exercise price	$	28.13	$	21.71
Aggregate intrinsic value	$ 11.7 million		$ 6.0 million
Weighted average remaining contractual term	4.9 years		2.6 years

Schedule of Restricted Stock Units Nonvested and Vested and Expected to Vest [Table Text Block]

The following table sets forth certain information regarding all RSUs nonvested and vested and expected to vest:

	December 31, 2011
	RSUs Nonvested		RSUs Vested and Expected to Vest
Number	857,582		787,454
Weighted average grant date per share fair value	$	31.00	$	31.34
Aggregate intrinsic value	$35.0 million		$ 32.1 million
Weighted average remaining term to vest	1.8 years		1.8 years

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Year Ended December 31, 2011
	Shares Subject to Options		Weighted Average Exercise Price
Balance, beginning of period	1,499		$	23.27
Granted	304		38.45
Forfeited	(21	)	24.70
Expired	(37	)	32.90
Exercised	(821	)	22.98
Balance, end of period	924		28.13

Schedule of Share-based Compensation, Restricted Stock Units Activity [Table Text Block]

	Year Ended December 31, 2011
	Restricted Stock Units		Weighted Average Grant Date Per Share Fair Value
Balance, beginning of period	821		$	24.97
Granted	401		38.70
Forfeited	(52	)	25.16
Vested	(312	)	25.99
Balance, end of period	858		31.00

Stock-Based Compensation Disclosures [Table Text Block]

Certain information regarding our stock-based compensation was as follows (in thousands):

	Year Ended December 31,
	2011		2010		2009
Weighted average grant-date fair value of stock options granted	$	11,703	$	6,516	$	6,479
Weighted average grant-date fair value of restricted stock units	15,499		7,830		7,939
Total intrinsic value of stock options exercised	10,550		554		653
Fair value of restricted stock units vested	8,120		7,587		6,829
Cash received from stock options exercised and shares purchased under all stock-based arrangements	24,382		7,983		6,871
Tax benefit realized for stock options	2,918		12,084		—

Schedule of Employee Stock-Based Compensation Expense

Our stock-based compensation expense was included in our statements of operations as follows (in thousands):

	Year Ended December 31,
	2011		2010		2009
Cost of sales	$	1,511	$	1,211	$	1,352
Research and development	1,873		1,538		1,312
Selling, general and administrative	7,727		7,733		7,935
Total stock-based compensation	$	11,111	$	10,482	$	10,599

Schedule of Stock-Bbased Compensation Valuation Assumptions [Table Text Block]

The following weighted average assumptions were used in determining fair value pursuant to the Black-Scholes option pricing model:

	Year Ended December 31,
	2011		2010		2009
Risk-free interest rate	0.06% - 2.02%		0.14% - 2.27%		0.14% - 2.35%
Dividend yield	—	%	—	%	—	%
Expected term:
Option plans	5.5 - 5.7 years		5.6 - 5.9 years		5.2 years
Employee share purchase plan	6 months		6 months		6 months
Volatility	36% - 55%		31% - 51%		44% - 51%
Discount for post vesting restrictions	—	%	—	%	—	%