Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

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:

	December 31, 2013
Shares available for grant	1,998,881
Shares of common stock reserved for issuance	3,487,290

Schedule of Options Outstanding and Exercisable

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

	December 31, 2013
	Options Outstanding		Options Exercisable
Number	751,853		232,828
Weighted average exercise price	$	50.18	$	31.80
Aggregate intrinsic value	$ 29.5 million		$ 13.4 million
Weighted average remaining contractual term	5.1 years		3.8 years

Schedule of Restricted Stock Units Nonvested and Expected to Vest

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

	December 31, 2013
	RSUs Nonvested		RSUs Expected to Vest
Number	745,060		637,692
Weighted average grant date per share fair value	$	57.60	$	56.75
Aggregate intrinsic value	$ 65.8 million		$ 57.0 million
Weighted average remaining term to vest	1.7 years		1.6 years

Schedule of Stock Option Activity

Activity under these plans was as follows (share amounts in thousands):

	Year Ended December 31, 2013
	Shares Subject to Options		Weighted Average Exercise Price
Balance, beginning of period	870		$	35.81
Granted	198		82.11
Forfeited	(47	)	37.38
Expired	(4	)	15.56
Exercised	(265	)	29.69
Balance, end of period	752		50.18

Schedule of Restricted Stock Unit Activity

	Year Ended December 31, 2013
	Restricted Stock Units		Weighted Average Grant Date Per Share Fair Value
Balance, beginning of period	871		$	41.69
Granted	244		83.58
Forfeited	(61	)	41.14
Vested	(309	)	37.00
Balance, end of period	745		57.60

Stock-Based Compensation Disclosures

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

	Year Ended
	2013		2012		2011
Weighted average grant-date fair value of stock options granted	$	16,283	$	12,279	$	11,703
Weighted average grant-date fair value of restricted stock units	20,415		20,461		15,499
Total intrinsic value of stock options exercised	13,169		6,293		10,550
Fair value of restricted stock units vested	11,452		9,113		8,120
Cash received from stock options exercised and shares purchased under all stock-based arrangements	16,545		13,131		24,382
Tax benefit realized for stock options	6,495		3,137		2,918

Schedule of Stock-Based Compensation Expense

Our stock-based compensation expense was included in our Consolidated Statements of Operations as follows (in thousands):

	Year Ended
	2013		2012		2011
Cost of sales	$	2,427	$	1,858	$	1,511
Research and development	2,156		1,903		1,873
Selling, general and administrative	13,744		10,393		7,727
Total stock-based compensation	$	18,327	$	14,154	$	11,111

Schedule of Stock-Based Compensation Valuation Assumptions

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

	Year Ended
	2013		2012		2011
Risk-free interest rate	0.07% - 1.72%		0.13% - 0.81%		0.06% - 2.02%
Dividend yield	0.44% - 0.59%		0% - 0.72%		—	%
Expected term:
Option plans	3.1 - 5.1 years		5.3 - 5.5 years		5.5 - 5.7 years
Employee share purchase plan	6 months		6 months		6 months
Volatility	23% - 43%		36% - 55%		36% - 55%
Discount for post vesting restrictions	—	%	—	%	—	%