STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2015

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 Consolidated Statements of Income:

In thousands
	Years Ended December 31,
	2015		2014		2013
Cost of revenues - stock option plan	$	92	$	52	$	120
Selling, general and administrative - stock option plan	18,541		15,214		15,212
Selling, general and administrative - RSUs	1,484		1,267		1,116
Selling, general and administrative - ESPP	1,633		1,240		1,009
Total pre-tax expense	$	21,750	$	17,773	$	17,457

Tax Benefits Related to Stock Compensation

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

In thousands
	Years Ended December 31,
	2015		2014		2013
Tax benefit recognized in Statements of Income	$	5,567	$	4,849	$	4,518
Excess tax benefit realized	16,897		17,906		17,153

Stock Option Activity

Stock option activity for the year ended December 31, 2015, is summarized as follows:

	Number of Options		Weighted Average Exercise Price per Share
Outstanding at beginning of year	5,377,857		$	80.88
Granted	1,056,490		130.56
Exercised	(906,104	)	66.93
Forfeited	(188,927	)	111.07
Canceled or expired	(4,513	)	84.52
Outstanding at December 31, 2015	5,334,803		92.02
Exercisable at December 31, 2015	2,747,266		73.22
Vested and expected to vest at December 31, 2015	5,135,286		91.00

Intrinsic Value of Options Exercised

The following table sets forth the total intrinsic value of options exercised for the years ended December 31:

In thousands
	2015		2014		2013
Total exercise intrinsic value of options exercised	$	62,625	$	65,884	$	55,757

Information Related to Outstanding and Exercisable Options

The following table sets forth the information related to outstanding and exercisable options for the years ended December 31:

	2015		2014		2013
Weighted average remaining contractual life of outstanding options (in years)	5.70		6.10		6.60
Total aggregate intrinsic value of outstanding options (in thousands)	$	162,400	$	269,900	$	254,200
Weighted average remaining contractual life of exercisable options (in years)	4.70		5.10		5.30
Total aggregate intrinsic value of exercisable options (in thousands)	$	130,600	$	178,300	$	161,100

Options Outstanding and Exercisable by Price Range

Options outstanding and exercisable at December 31, 2015 by price range are presented below:

	Options Outstanding				Options Exercisable
Range of Exercise Price	Shares	Outstanding Average Remaining Life in Years	Weighted Average Exercise Price		Shares	Weighted Average Exercise Price
$29.54 - $51.55	912,043	3.15	$	47.61	912,043	$	47.61
$52.05 - $85.00	956,708	4.22	72.90		817,286	70.84
$85.02 - $85.76	10,650	6.25	85.40		5,750	85.37
$86.24 - $86.24	604,758	6.09	86.24		302,334	86.24
$86.83 - $95.03	142,097	6.02	89.83		110,895	89.11
$95.87 - $95.87	781,470	7.12	95.87		299,599	95.87
$95.92 - $115.51	162,252	7.25	110.41		102,739	109.94
$115.69 - $115.69	732,411	6.14	115.69		147,361	115.69
$115.82 - $130.11	128,583	7.68	122.59		15,954	117.80
$130.19 - $141.56	903,831	7.33	131.20		33,305	133.49
$29.54 - $141.56	5,334,803	5.70	$	92.02	2,747,266	$	73.22

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:

	Years Ended December 31,
	2015			2014			2013
Stock options granted (shares)	1,056,490			981,583			1,057,630
Weighted average fair value at grant date	$	22.90		$	21.31		$	22.02
Assumptions:
Expected term (in years)	4.79			4.76			5.81
Expected volatility	16.71		%	17.23		%	27.03		%
Expected dividend yield	—		%	—		%	—		%
Risk free interest rate	1.47		%	1.53		%	1.00		%

Information Related to RSUs

The following table sets forth the information related to RSUs for the years ended December 31:

	2015		2014		2013
Total aggregate intrinsic value of outstanding units (in thousands)	$	8,441	$	8,337	$	8,185
Per share fair value of units granted	114.27		115.67		96.40

Restricted Stock Units Activity

A summary of the status of our non-vested RSUs and changes during the year ended December 31, 2015, are as follows:

	Number of Units		Weighted Average Grant Date Fair Value
Non-vested at beginning of year	63,600		$	96.04
Granted	12,124		114.27
Forfeited	(4,273	)	101.20
Non-vested at December 31, 2015	71,451		101.29