STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased 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 ExercisePrice		Shares		Weighted Average ExercisePrice
$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 DateFairValue
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