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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Marketable Securities Tables Abstract  
Schedule of Available-For-Sale Marketable Securities
The following is a summary of available-for-sale marketable securities at December 31, 2018:

   
Amortized
cost
    
Gross unrealized
gains
    
Gross unrealized
losses
    
Fair
value
  
                         
Available-for-sale – matures within one year:
                        
Corporate bonds
  
$
110,904
    
$
-
    
$
(519
)
  
$
110,385
  
Governmental bonds
    
8,343
      
-
      
(48
)
    
8,295
  
     
119,247
      
-
      
(567
)
    
118,680
  
                                 
Available for-sale – matures after one year:
                                
Corporate bonds
    
74,564
      
-
      
(308
)
    
74,256
  
     
74,564
      
-
      
(308
)
    
74,256
  
                                 
Total
  
$
193,811
    
$
-
    
$
(875
)
  
$
192,936
  

The following is a summary of available-for-sale marketable securities at December 31, 2017:

   
Amortized
cost
    
Gross unrealized
gains
    
Gross unrealized
losses
    
Fair
value
  
                         
Available for-sale – matures within one year:
                        
Corporate bonds
  
$
68,392
    
$
1
    
$
(121
)
  
$
68,272
  
Governmental bonds
    
9,019
      
-
      
(27
)
    
8,992
  
     
77,411
      
1
      
(148
)
    
77,264
  
                                 
Available for-sale – matures after one year:
                                
Corporate bonds
    
95,540
      
-
      
(380
)
    
95,160
  
Governmental bonds
    
8,023
      
-
      
(63
)
    
7,960
  
     
103,563
      
-
      
(443
)
    
103,120
  
                                 
Total
  
$
180,974
    
$
1
    
$
(591
)
  
$
180,384
  

The following is a summary of available-for-sale marketable securities at December 31, 2016:

   
Amortized
cost
    
Gross unrealized
gains
    
Gross unrealized
losses
    
Fair
value
  
                         
Available for-sale – matures within one year:
                        
Corporate bonds
  
$
71,753
    
$
20
    
$
(54
)
  
$
71,719
  
Governmental bonds
    
2,758
      
-
      
(12
)
    
2,746
  
     
74,511
      
20
      
(66
)
    
74,465
  
                                 
Available for-sale – matures after one year:
                                
Corporate bonds
    
39,435
      
3
      
(159
)
    
39,279
  
Governmental bonds
    
5,004
      
-
      
(21
)
    
4,983
  
     
44,439
      
3
      
(180
)
    
44,262
  
                                 
Total
  
$
118,950
    
$
23
    
$
(246
)
  
$
118,727
  
Schedule of Amortized Cost of Available-For-Sale Marketable Securities
The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of December 31, 2018, 2017 and 2016, based on the investments maturity date:

   
12 months or less
    
Greater than 12 months
  
   
Fair value
    
Gross unrealized losses
    
Fair value
    
Gross unrealized losses
  
                         
As of December 31, 2018
  
$
118,680
    
$
(567
)
  
$
74,256
    
$
(308
)
As of December 31, 2017
  
$
72,269
    
$
(148
)
  
$
103,116
    
$
(443
)
As of December 31, 2016
  
$
51,124
    
$
(66
)
  
$
39,373
    
$
(180
)