SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2017

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

Schedule of assumptions used to determine the fair value of options as of the grant date

The following assumptions were used to determine the fair values as of the grant date:

	Six months ended  June 30, 2017		Six months ended  June 30, 2016
	Black-Scholes	Binomial	Black-Scholes	Binomial
Risk-free interest rate (%)	2.06 - 2.29	0.77 - 2.38	1.25 - 1.89	0.23 - 1.97
Expected stock price volatility (%)	61.49 - 66.68	66.68	59.75 - 62.14	59.76 - 62.14
Expected dividend yield	—	—	—	—
Expected option life (in years)	6.00 - 7.50	3.53 - 3.85	6.00 - 6.25	4.54 - 4.88
Fair value	$23.91 - $24.80	$23.54 - $24.30	$11.15 - $17.09	$11.06 - $17.58

Summary of the weighted average fair value of stock options granted, the total intrinsic value of stock options exercised and the fair value of options vested

The following table summarizes the weighted average grant date fair value of stock options granted per share, the total intrinsic value of stock options exercised and the grant date fair value of stock options that vested during the period presented:

	Six months ended June 30,
(in thousands, except per share amounts)	2017		2016
Weighted average grant date fair value of stock options granted per share	$	24.23	$	15.81
Intrinsic value of options exercised	875		1,002
Grant date fair value of stock options that vested	1,693		2,010

Summary of the activity of the entity's stock options

The following table summarizes the activity related to our stock options:

	Number of options		Weighted average exercise price		Weighted average contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2016	1,996,509		$	25.98	5.32	$	15,942
Granted	128,630		39.13
Exercised	(62,232	)	12.29
Forfeited	(200,316	)	29.32
Outstanding at June 30, 2017	1,862,591		26.99		4.87	9,075
Exercisable at June 30, 2017	1,286,618		21.56		3.40	6,257

Restricted stock and restricted stock units activity

The following table summarizes the activity related to our restricted shares:

	Number of restricted shares
Outstanding at December 31, 2016	231,730
Granted	120,842
Issued	(35,672	)
Forfeited/canceled	(56,511	)
Outstanding at June 30, 2017	260,389