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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Share Option Activity
   
2018
    
2017
    
2016
  
   
Number
of share options
    
Weighted average exercise price
    
Number
of share options
    
Weighted average exercise price
    
Number
of share options
    
Weighted average exercise price
  
Outstanding as of beginning of year
    
580,185
    
$
9.64
      
2,278,089
    
$
9.92
      
5,878,270
    
$
6.84
  
Granted
    
--
      
--
      
--
      
--
      
207,890
      
12.19
  
Exercised
    
(70,271
)
    
10.19
      
(1,611,489
)
    
9.27
      
(3,649,754
)
    
4.82
  
Terminated
    
(921
)
    
9.82
      
(77,292
)
    
25.89
      
(97,063
)
    
21.34
  
Forfeited
    
(500
)
    
4.42
      
(9,123
)
    
8.06
      
(61,254
)
    
7.25
  
Outstanding as of end of year
    
508,493
      
9.58
      
580,185
      
9.64
      
2,278,089
      
9.92
  
Options exercisable as of end of year
    
485,579
    
$
9.46
      
459,662
    
$
8.51
      
1,606,983
    
$
10.19
  
 
Schedule of Restricted Shares Units Activity
 
2018
    
2017
    
2016
  
   
Number
of RSU
    
Weighted Average
Fair Value
    
Number
of RSU
    
Weighted Average
Fair Value
    
Number
of RSU
    
Weighted Average
Fair Value
  
Outstanding as of beginning of year
    
1,245,889
    
$
21.29
      
1,009,184
    
$
14.62
      
773,200
    
$
15.11
  
Granted
    
977,667
      
20.80
      
818,856
      
24.88
      
359,643
      
12.83
  
Converted
    
(602,423
)
    
17.86
      
(553,241
)
    
14.71
      
(86,847
)
    
11.45
  
Forfeited
    
(21,837
)
    
22.11
      
(28,910
)
    
16.42
      
(36,812
)
    
14.73
  
Outstanding as of end of year
    
1,599,296
    
$
22.27
      
1,245,889
    
$
21.29
      
1,009,184
    
$
14.62
  
Schedule of Information about Share Options Outstanding
The following table summarizes information about employees’ share options outstanding as of December 31, 2018:

Outstanding
    
Exercisable
  
Range of exercise prices
    
Number outstanding
    
Weighted average remaining contractual life (in years)
    
Weighted average exercise price
    
Number exercisable
    
Weighted average exercise price
  
$
4.42 - 17.25
      
508,493
      
3.08
    
$
9.58
      
485,579
    
$
9.46
  
 
Schedule of Intrinsic and Fair Values for Options Exercised
 
Year ended December 31,
  
   
2018
    
2017
    
2016
  
The intrinsic value of options exercised
  
$
1,416
    
$
26,031
    
$
40,314
  
The original fair value of options exercised
  
$
302
    
$
7,202
    
$
16,711
  
Schedule of Intrinsic and Fair Values for RSU's Exercised
 
Year ended December 31,
  
   
2018
    
2017
    
2016
  
The intrinsic value of converted RSU's
  
$
15,840
    
$
12,996
    
$
1,177
  
The original fair value of converted RSU's
  
$
10,761
    
$
8,138
    
$
994
  
Schedule of Stock-Based Compensation Expense in Statement of Operations
Stock-based compensation expenses were recognized in the Statement of Operations as follows:

   
Year ended December 31,
  
   
2018
    
2017
    
2016
  
Cost of goods
  
$
3,141
    
$
3,084
    
$
3,920
  
Research and development, net
    
2,533
      
2,555
      
2,119
  
Marketing, general and administrative
    
6,987
      
6,010
      
3,367
  
Total stock-based compensation expense
  
$
12,661
    
$
11,649
    
$
9,406
  
Schedule of Fair Value of Options Granted
The Company estimated the fair value, utilizing the following assumptions for the year 2016 (all in weighted averages):
 
   
2016
  
Risk-free interest rate
    
0.9%-1.3%  
 
Expected life of options
  
4.60 years
  
Expected annual volatility
    
47%-48%  
Expected dividend yield
  
None