STOCK BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2014

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

Stock-Based Compensation Expense Resulting from Stock Option Awards, Restricted stock units ("RSU") and ESPP

The following table presents the total stock-based compensation expense resulting from stock option awards, restricted stock units (“RSUs”), and the ESPP included in the Condensed Consolidated Statements of Income:

In thousands
	Three Months Ended March 31,
	2014		2013
Cost of revenues – stock option plan	$	7	$	40
Selling, general and administrative – stock option plan	4,041		3,530
Selling, general and administrative – RSUs	315		195
Selling, general and administrative – ESPP	309		282
Total pre-tax expense	$	4,672	$	4,047

Tax Benefits Related to Stock Compensation

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

In thousands
	Three Months Ended March 31,
	2014		2013
Tax benefit recognized in Statement of Income	$	909	$	1,130
Excess tax benefit realized	3,734		4,203

Stock Option Activity

Stock option activity for the three months ended March 31, 2014, is summarized as follows:

	Number of Options		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life	Total Aggregate Intrinsic Value
					(in years)	(in thousands)
Outstanding at beginning of year	5,540,482		$	70.29
Granted	854,778		115.70
Exercised	(182,867	)	51.61
Forfeited	(28,088	)	84.58
Canceled or expired	(1,049	)	65.11
Outstanding at March 31, 2014	6,183,256		$	77.06	6.59	$	227,883
Exercisable at March 31, 2014	3,417,439		$	62.02	5.54	$	176,414
Vested and expected to vest at March 31, 2014	5,884,031		$	75.89

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).

In thousands
	Three Months Ended March 31,
	2014		2013
Total intrinsic value of options exercised	$	11,796	$	14,562

Assumptions used in Black-Scholes Model

The estimated fair value of stock options at the time of the grant using the Black-Scholes model option pricing model was as follows:

	Three Months Ended March 31,
	2014			2013
Stock options granted (shares)	854,778			977,090
Weighted average fair value at grant date	$	21.28		$	21.57
Assumptions:
Expected term (in years)	4.78			6.00
Expected volatility	17.68		%	27.10		%
Expected dividend yield	—		%	—		%
Risk free interest rate	1.45		%	0.99		%

Restricted Stock Units Activity

A summary of the status of our non-vested RSUs and changes during the three months ended March 31, 2014, are as follows:

	Number of Units		Weighted Average Grant Date Fair Value		Total Aggregate Intrinsic Value
					(in thousands)
Non-vested at beginning of year	70,457		$	88.32
Granted	16,084		115.69
Vested and released	(17,288	)	85.00
Forfeited	(5,383	)	88.10
Non-vested at March 31, 2014	63,870		$	96.13	$	7,257