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SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Summary of Stock Option Activity

A summary of employees and directors option activity under the Company's Stock Option Plans as of December 31, 2016, 2015 and 2014 is as follows:

		Number of options				Weighted-average exercise price				Weighted- average remaining contractual term (in years)				Aggregate intrinsic value
Outstanding at January 1, 2016			5,201,661			$	16.51				3.06			$	2,748
Granted			2,772,300				12.94
Exercised			(139,400	)			12.18
Expired			(416,523	)			17.06
Forfeited			(1,389,150	)			19.09
Outstanding at December 31, 2016			6,028,888			$	14.33				3.27			$	5,070
Exercisable at December 31, 2016			2,014,403			$	15.28				1.85			$	597
Vested and expected to vest at December 31, 2016			5,475,668			$	14.44				3.16			$	4,236

		Number of options				Weighted-average exercise price				Weighted- average remaining contractual term (in years)				Aggregate intrinsic value
Outstanding at January 1, 2015			4,702,920			$	15.54				3.22			$	30,474
Granted			1,562,000				18.96
Exercised			(600,393	)			14.57
Expired			(160,000	)			16.92
Forfeited			(302,866	)			17.76
Outstanding at December 31, 2015			5,201,661			$	16.51				3.06			$	2,748
Exercisable at December 31, 2015			1,791,130			$	15.32				1.91			$	1,578
Vested and expected to vest at December 31, 2015			4,878,629			$	16.44				2.99			$	2,655

		Number of options				Weighted-average exercise price				Weighted- average remaining contractual term (in years)				Aggregate intrinsic value
Outstanding at January 1, 2014			7,073,511			$	11.74				2.62			$	44,716
Granted			1,239,375				17.14
Exercised			(3,058,966	)			7.35
Expired			-				-
Forfeited			(551,000	)			14.83
Outstanding at December 31, 2014			4,702,920			$	15.54				3.22			$	30,474
Exercisable at December 31, 2014			1,265,300			$	15.57				1.58			$	8,161
Vested and expected to vest at December 31, 2014			4,320,142			$	15.99				3.14			$	26,033

Summary of Stock Options Outstanding by Exercise Price Range

The options outstanding under the Company's Stock Option Plans as of December 31, 2016, 2015 and 2014 have been separated into ranges of exercise price as follows:

December 31, 2016
Outstanding																Exercisable
								Weighted
								average				Weighted								Weighted
Ranges of								remaining				average								average
exercise				Number of				contractual				exercise				Number of				exercise
price				options				life (years)				price				options				price
$	10.08-14.74				4,190,733				3.66				13.38				982,890				13.97
$	15.09-19.30				1,793,905				2.37				16.34				1,031,513				16.52
$	20.62-23.66				44,250				3.47				22.81				-				-
					6,028,888												2,014,403

December 31, 2015
Outstanding																Exercisable
								Weighted
								average				Weighted								Weighted
Ranges of								remaining				average								average
exercise				Number of				contractual				exercise				Number of				exercise
price				options				life (years)				price				options				price
$	12.18-14.74				1,861,208				2.98				13.91				863,792				13.56
$	15.09-19.30				2,557,703				2.67				16.69				927,338				16.96
$	20.62-23.66				782,750				4.53				22.10				-				-
					5,201,661												1,791,130

December 31, 2014
Outstanding																Exercisable
								Weighted
								average				Weighted								Weighted
Ranges of								remaining				average								average
exercise				Number of				contractual				exercise				Number of				exercise
price				options				life (years)				price				options				price
$	7.65				60,350				0.25				7.65				60,350				7.65
$	11.94-14.47				1,861,533				3.32				13.58				334,200				12.19
$	15.09-19.30				2,781,037				3.21				17.03				870,750				17.41
					4,702,920												1,265,300

Summary of RSU Activity

The following table summarizes information relating to RSUs, as well as changes to such awards during 2016:

		Year ended December 31,
		2016
		Number in thousands
Outstanding at January 1, 2016			818,364
Granted			743,188
Vested			(154,633	)
Forfeited			(123,989	)
Outstanding as of December 31, 2016			1,282,930

Summary of Stock-Based Compensation Expense

Stock-based compensation was recorded in the following items within the consolidated statements of income (loss):

		Year ended December 31,
		2016				2015				2014
Cost of revenues		$	180			$	141			$	79
Research and development, net			3,339				2,456				1,421
Sales and marketing			5,661				4,098				2,950
General and administrative			2,340				2,634				2,932
Total expenses		$	11,520			$	9,329			$	7,382

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