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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2012

The following table summarizes stock option activity for the six months ended June 30, 2012:


	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value ⁽¹⁾
Outstanding at December 31, 2011		4,301,808		$	18.34
Granted		370,538		$	66.99
Exercised		(949,531	)	$	11.93
Forfeited		(48,487	)	$	25.88

Outstanding at June 30, 2012		3,674,328		$	24.80		7.03	$	244.7

Vested and exercisable at June 30, 2012		2,092,153		$	19.60		5.74	$	150.2

(1)	The aggregate intrinsic value is calculated as the pre-tax difference between the exercise price of the underlying awards and the closing stock price per share of $91.40 of the Company’s common stock on June 29, 2012. The amount is presented in millions.

Schedule Of Black-Scholes Assumptions Used For Stock Options

The following presents the assumptions used to estimate the fair value of stock options granted and the weighted-average grant date fair value per share of options granted during the periods presented:


	Three months ended June 30,					Six months ended June 30,
	2012			2011⁽¹⁾		2012			2011
Risk-free interest rate		0.83	%		—		0.83 - 1.01	%		2.33 - 2.34	%
Estimated term (in years)		5.42			—		5.42 - 5.48			5.99
Estimated volatility		71	%		—		71 - 73	%		81	%
Estimated dividend yield		—			—		—			—
Weighted-average grant date fair value per share of options granted	$	51.73		$	—	$	40.91		$	11.07

(1)	No stock options were granted during the three months ended June 30, 2011.

Summary Of Restricted Stock Units

The following table summarizes restricted stock unit activity for the six months ended June 30, 2012:


	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2011		101,617		$	14.35
Granted		32,903		$	46.39
Forfeited		(9,737	)	$	23.59

Unvested at June 30, 2012		124,783		$	22.07

Schedule Of Performance Share Awards

The following summarizes the performance share awards outstanding and eligible to be earned at June 30, 2012:


	Base Case Achievement		Upside Case Achievement
Performance shares eligible to be earned		20,835		41,666

Summary Of Stock Appreciation Rights Activity

The following table summarizes stock appreciation rights activity for the six months ended June 30, 2012:


	Number of Rights			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value ⁽¹⁾
Outstanding at December 31, 2011		262,800		$	48.79
Granted		193,700		$	46.39
Forfeited		(14,700	)	$	46.39

Outstanding at June 30, 2012		441,800		$	47.81		9.48	$	19.3

(1)	The aggregate intrinsic value is calculated as the pre-tax difference between the exercise price of the underlying awards and the closing stock price per share of $91.40 of the Company’s common stock on June 29, 2012. The amount is presented in millions.

Schedule Of Black-Scholes Assumptions Used For Stock Appreciation Rights Awards

The fair value of each cash-settled stock appreciation right was estimated on the date of the grant, and was remeasured at June 30, 2012, using the Black-Scholes valuation model with the following assumptions:


	Stock Appreciation Rights Granted During the Six Months Ended June 30, 2012			Remeasurement as of June 30, 2012
Risk-free interest rate		1.01	%		0.83	%
Estimated term (in years)		5.48			5.42
Estimated volatility		73	%		71	%
Estimated dividend yield		—			—

Schedule Of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:


	Three months ended June 30,				Six months ended June 30,
	2012		2011		2012		2011
Stock-based compensation expense recognized as:
Research and development expense	$	3,048	$	2,108	$	5,485	$	4,178
Selling, general and administrative expense		2,533		1,567		4,432		3,111

Total	$	5,581	$	3,675	$	9,917	$	7,289