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SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of Assumptions Used to Determine Fair Value of Options Granted

The fair value of the Company's stock options granted to employees and directors for the years ended December 31, 2017, 2016 and 2015 was estimated using the following assumptions:

		2017		2016		2015
Expected volatility		21.69%-22.90%		21.05%-25.92%		23.02%-27.55%
Risk free interest rate		1.53%-2.00%		0.58%-2.04%		0.76%-1.18%
Expected dividend		0%		0%-1.00%		0%-1.29%
Expected term (in years)		3.5		3.5		3.5

Schedule of Stock Option Activity

A summary of the Company's stock options activity and related information for the year ended December 31, 2017, is as follows:

		Number of options				Weighted-average exercise price				Weighted- average remaining contractual term (in years)				Aggregate intrinsic value
Outstanding at January 1, 2017			2,273,664				23.61				4.46				102,652
Granted			444,826				20.75
Exercised			(813,787	)			23.35
Forfeited			(224,289	)			22.85
Cancelled			(4,284	)			15.00
Outstanding at December 31, 2017			1,676,130				23.07				4.45				115,390
Exercisable at December 31, 2017			598,843				33.38				3.45				35,049

Schedule of Options Outstanding by Exercise Price Range

The options outstanding under the Company's stock option plans as of December 31, 2017 have been separated into ranges of exercise price as follows:

																				Weighted
				Options				Weighted								Options				average
				outstanding				average				Weighted				exercisable				exercise
				as of				remaining				average				as of				price of
Ranges of				December 31,				contractual				exercise				December 31,				options
exercise price				2017				term				price				2017				exercisable
								(Years)				$									$
$	0.29				922,427				4.46				0.29				197,933				0.29
$	0.69				1,888				1.90				0.69				1,888				0.69
$	6.72-9.89				8,861				6.66				7.03				6,655				7.12
$	11.40-15.16				3,301				2.73				14.09				3,301				14.09
$	17.72				934				3.20				17.72				934				17.72
$	28.64-42.92				339,873				4.12				39.15				200,777				38.61
$	43.01-64.06				211,186				4.52				52.79				90,409				59.11
$	64.61-85.14				187,660				4.83				73.63				96,946				69.36
					1,676,130				4.45				23.07				598,843				33.38

Schedule of Restricted Stock Units Activity

A summary of the Company's RSU and the Company's RSA activities and related information for the year ended December 31, 2017, is as follows:

		Number of RSU and RSA (*)
Outstanding at January 1, 2017			1,498,643
Granted			654,315
Vested			(456,807	)
Cancelled			(250	)
Forfeited			(170,889	)
Outstanding at December 31, 2017			1,525,012

(*) NIS 1 par value which represents approximately $0.29

Schedule of Allocated Share-Based Compensation Expense

The total equity-based compensation expense related to all of the Company's equity-based awards, recognized for the years ended December 31, 2017, 2016 and 2015, was comprised as follows:

		Year ended December 31,
		2017				2016				2015
Cost of revenues		$	11,337			$	7,878			$	3,712
Research and development, net			9,038				5,676				2,161
Selling and marketing			23,107				16,403				11,266
General and administrative			13,498				10,590				10,521
Total stock-based compensation expenses		$	56,980			$	40,547			$	27,660

X

- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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