STOCK BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense Resulting from Stock Option Awards, RSUs, PSUs and ESPP

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

In thousands
	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Cost of revenues - stock option plan	$	13	$	26	$	39	$	53
Selling, general and administrative - stock option plan		3,650		4,287		11,539		13,624
Selling, general and administrative - RSUs		1,189		302		4,136		1,260
Selling, general and administrative - PSUs		201		—		577		—
Selling, general and administrative - ESPP		329		499		971		1,734
Total pre-tax expense	$	5,382	$	5,114	$	17,262	$	16,671

Stock Option Activity

Stock option activity during the nine months ended September 30, 2017, 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 as of January 1, 2017		5,468,732		$	96.90
Granted		454,799			82.95
Exercised		(119,631	)		50.54
Forfeited		(105,117	)		112.63
Cancelled or expired		(108,479	)		101.17
Outstanding as of September 30, 2017		5,590,304		$	96.38		4.82	$	17,312
Exercisable as of September 30, 2017		3,572,197		$	89.48		4.12	$	17,311

Intrinsic Value of Options Exercised

The following table sets forth the intrinsic value of options exercised for the three and nine months ended September 30:

In thousands
	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Total intrinsic value of options exercised	$	260	$	4,443	$	3,520	$	24,693

Assumptions Used in Black-Scholes Option Pricing Model

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Stock options granted (shares)		18,015			55,100			454,799			1,095,207
Weighted average fair value at grant date	$	17.83		$	20.02		$	19.48		$	20.17
Assumptions:
Expected term (in years)		4.83			4.80			4.82			4.77
Expected volatility		22.95	%		21.30	%		22.68	%		18.26	%
Expected dividend yield		—	%		—	%		—	%		—	%
Risk free interest rate		1.81	%		0.95	%		1.90	%		1.21	%

Summary of RSU Activity

A summary of our RSU activity during the nine months ended September 30, 2017, is summarized as follows:

	Number of Units			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life	Total Aggregate Intrinsic Value
						(in years)	(in thousands)
Outstanding as of January 1, 2017		114,838		$	104.22
Granted		209,268			83.05
Vested and released		(37,185	)		93.87
Forfeited		(11,817	)		93.91
Outstanding as of September 30, 2017		275,104		$	89.95	2.17	$	19,703