STOCK BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation Expense Resulting from Stock Option Awards and ESPP

The following table presents the total stock-based compensation expense resulting from stock option awards and the ESPP included in the condensed consolidated statements of comprehensive income:

In thousands
	Three Months Ended March 31,
	2012		2011
Cost of revenues – stock option plan	$	38	$	26
Selling, general and administrative – stock option plan		3,480		3,424
Selling, general and administrative – restricted stock unit		303		158
Selling, general and administrative – ESPP		264		255
Total pre-tax expense	$	4,085	$	3,863

Tax Benefits Related to Stock Compensation

The following table sets forth the tax benefits related to stock compensation:

	Three Months Ended March 31,
In thousands	2012		2011
Tax benefit recognized in the income statement	$	1,119	$	1,268
Excess tax benefit realized		5,061		8,092

Assumptions Used in Black-Scholes Model

The assumptions that we used in the Black-Scholes model are as follows:

	Three Months Ended March 31,
	2012			2011
Expected term (in years)		6.0			5.75
Expected volatility		27.87	%		26.88	%
Expected dividend yield		0.00	%		0.00	%
Risk free interest rate		1.076	%		2.28	%

Weighted Average Grant Date Fair Value of Stock Options Granted

The weighted average grant date fair value of the stock options granted during the three months ended March 31, 2012 and 2011 was as follows:

	Three Months Ended March 31,
	2012		2011
Weighted average fair value at grant date	$	19.90	$	20.51

Stock Option Activity

Stock option activity for the three months ended March 31, 2012, was as follows:

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
						(in years)
Outstanding at December 31, 2011		6,342,337		$	50.06
Granted		983,755			86.22
Exercised		(336,436	)		37.14
Cancelled or expired		(16,435	)		57.94
Outstanding at March 31, 2012		6,973,221		$	55.74		6.81	$	198,903,742
Exercisable at March 31, 2012		3,981,153		$	44.43		5.56	$	156,678,425
Vested and expected to vest in the future at March 31, 2012		6,174,592		$	53.35		6.56	$	190,203,151

Intrinsic Value of Options Exercised

The total exercise intrinsic value represents the total pre-tax value (the difference between the sales price on that trading day in the quarter ended March 31, and the exercise price associated with the respective option).

	Three Months Ended March 31,
In thousands	2012		2011
Total exercise intrinsic value of options exercised	$	16,582	$	24,274

Restricted Stock Units Activity

Restricted stock units (“RSUs”) activity for the quarter ended March 31, 2012 is summarized below. RSUs vest at the end of three years. Our 2008 Plan includes a share reserve related to RSUs granted at a 2-1 ratio.

	March 31, 2012
	Number of Units		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
			(in years)
Outstanding at beginning of year		34,738
Granted		39,237
Forfeited		0
Outstanding at end of year		73,975		3.24	$	6,187,269
Exercisable at end of year		0		0.00		0
Vested and expected to vest in the future		46,472		2.74	$	3,886,902