Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Black-Scholes Assumptions Used For Stock Options And Stock Appreciation Rights

The Company estimated the fair value of stock options and stock appreciation rights using the Black-Scholes valuation model. The Black-Scholes assumptions used for stock options and stock appreciation rights granted and/or remeasured during the periods presented were:


	Years Ended December 31,
	2012			2011			2010
Expected volatility		66-73	%		71-86	%		71-72	%
Expected term (in years)		5.3-5.5			5.6-6.0			6.0
Risk-free interest rate		0.68-1.01	%		1.02-2.34	%		1.48-2.39	%
Expected dividend yield		—			—			—

Summary Of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2012, as adjusted to reflect the two-for-one forward stock split effected on September 21, 2012:


	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value⁽¹⁾
Options outstanding at December 31, 2011		8,603,616		$	9.17
Granted		1,785,656		$	44.43
Exercised		(3,143,360	)	$	7.01
Forfeited		(207,621	)	$	17.42

Options outstanding at December 31, 2012		7,038,291		$	18.90		7.28	$	229.6

Vested and exercisable at December 31, 2012		3,721,873		$	10.41		5.88	$	151.7

(1)	The aggregate intrinsic value is calculated as the pre-tax difference between the weighted-average exercise price of the underlying awards and the closing price per share of $51.16 of the Company’s common stock on December 31, 2012. The amount is presented in millions.

Schedule Of Value Of Options Vested And Exercised

Additional information regarding stock options is set forth below:


	Years Ended December 31,
	2012		2011		2010
Intrinsic value of options exercised	$	116,867	$	22,238	$	8,584
Grant-date fair value of options vested	$	10,795	$	12,608	$	13,730
Weighted-average grant-date fair value per share of options granted (split-adjusted)	$	26.01	$	6.88	$	4.82

Summary Of Restricted Stock Units

The following table summarizes restricted stock unit activity for the year ended December 31, 2012, as adjusted to reflect the two-for-one forward stock split effected on September 21, 2012:


	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2011		203,234		$	7.17
Granted		309,086		$	47.19
Vested		(113,112	)	$	9.90
Forfeited		(25,583	)	$	12.90

Unvested at December 31, 2012		373,625		$	39.06

Schedule Of Performance Share Awards

The following table summarizes performance share award activity for the year ended December 31, 2012, as adjusted to reflect the two-for-one forward stock split effected on September 21, 2012:


	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2011		125,000		$	24.40
Earned		(83,332	)	$	24.40
Cancelled		(41,668	)	$	24.40

Unvested at December 31, 2012		—			—

Summary Of Stock Appreciation Rights Activity

The following table summarizes stock appreciation rights activity for the year ended December 31, 2012, as adjusted to reflect the two-for-one forward stock split effected on September 21, 2012:


	Number of Rights			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value⁽¹⁾
Outstanding at December 31, 2011		525,600		$	24.40
Granted		387,400		$	23.20
Forfeited		(29,400	)	$	23.20

Outstanding at December 31, 2012		883,600		$	23.91		8.97	$	24.1

Vested and exercisable at December 31, 2012		131,400		$	24.40		8.95	$	3.5

(1)	The aggregate intrinsic value is calculated as the pre-tax difference between the weighted-average exercise price of the underlying awards and the closing price per share of $51.16 of the Company’s common stock on December 31, 2012. The amount is presented in millions.

Schedule Of Stock-Based Compensation Expense

Stock-based compensation expense was as follows for the periods presented:


	Years Ended December 31,
	2012		2011		2010
Stock-based compensation expense recognized as:
R&D expenses	$	11,998	$	8,090	$	7,629
SG&A expenses		11,680		5,795		5,901

Total	$	23,678	$	13,885	$	13,530