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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Schedule of Marketable Securities With Contractual Maturities
Marketable securities with contractual maturities of less than one year are as follows:

   
December 31,
  
   
2016
    
2015
  
   
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
    
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
  
   
cost
    
losses
    
gains
    
Value
    
cost
    
losses
    
gains
    
Value
  
                                                 
Foreign banks and government debentures
  
$
15,361
    
$
(10
)
  
$
51
    
$
15,402
    
$
5,895
    
$
(15
)
  
$
16
    
$
5,896
  
Corporate debentures
    
5,046
      
-
      
4
      
5,050
      
4,393
      
(1
)
    
17
      
4,409
  
Corporate shares
    
-
      
-
      
-
      
-
      
3,762
      
-
      
1,936
      
5,698
  
                                                                 
Total available-for-sale marketable securities
  
$
20,407
    
$
(10
)
  
$
55
    
$
20,452
    
$
14,050
    
$
(16
)
  
$
1,969
    
$
16,003
  
 
Marketable securities with contractual maturities from one to three years are as follows:

   
December 31,
  
   
2016
    
2015
  
   
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
    
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
  
   
cost
    
losses
    
gains
    
Value
    
cost
    
losses
    
gains
    
Value
  
                                                 
Foreign banks and government debentures
  
$
31,040
    
$
(45
)
  
$
76
    
$
31,071
    
$
38,383
    
$
(117
)
  
$
149
    
$
38,415
  
Corporate debentures
    
28,980
      
(26
)
    
65
      
29,019
      
32,008
      
(143
)
    
43
      
31,908
  
                                                                 
Total available-for-sale marketable securities
  
$
60,020
    
$
(71
)
  
$
141
    
$
60,090
    
$
70,391
    
$
(260
)
  
$
192
    
$
70,323
  

Marketable securities with contractual maturities of more than three years are as follows:

   
December 31,
  
   
2016
    
2015
  
   
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
    
Adjusted
    
Gross unrealized
    
Gross unrealized
    
Market
  
   
cost
    
Losses
    
gains
    
Value
    
cost
    
Losses
    
gains
    
Value
  
                                                 
Foreign banks and government debentures
  
$
7,738
    
$
(111
)
  
$
-
    
$
7,627
    
$
6,356
    
$
(71
)
  
$
-
    
$
6,285
  
Corporate debentures
    
7,281
      
(60
)
    
29
      
7,250
      
11,342
      
(136
)
    
-
      
11,206
  
                                                                 
Total available-for-sale marketable securities
  
$
15,019
    
$
(171
)
  
$
29
    
$
14,877
    
$
17,698
    
$
(207
)
  
$
-
    
$
17,491
  

Summary of Investments With Continuous Unrealized Losses and Related Fair Values
Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2016 and 2015 were as follows:

   
December 31, 2016
  
   
Investments with continuous unrealized losses for less than 12 months
    
Investments with continuous unrealized losses for 12 months or greater
    
Total investments with continuous unrealized losses
  
   
Fair
Value
    
Unrealized
losses
    
Fair
value
    
Unrealized
losses
    
Fair
value
    
Unrealized
losses
  
                                     
Foreign banks and government debentures
  
$
20,118
    
$
(139
)
  
$
2,325
    
$
(28
)
  
$
22,443
    
$
(167
)
Corporate debentures
    
13,444
      
(79
)
    
1,013
      
(6
)
    
14,457
      
(85
)
                                                 
Total available-for-sale marketable securities
  
$
33,562
    
$
(218
)
  
$
3,338
    
$
(34
)
  
$
36,900
    
$
(252
)
 
   
December 31, 2015
  
   
Investments with continuous unrealized losses for less than 12 months
    
Investments with continuous unrealized losses for 12 months or greater
    
Total investments with continuous unrealized losses
  
   
Fair
Value
    
Unrealized
losses
    
Fair
value
    
Unrealized
losses
    
Fair
value
    
Unrealized
losses
  
                                     
Foreign banks and government debentures
  
$
16,041
    
$
(64
)
  
$
15,660
    
$
(139
)
  
$
31,701
    
$
(203
)
Corporate debentures
    
9,697
      
(93
)
    
24,347
      
(188
)
    
34,044
      
(281
)
                                                 
Total available-for-sale marketable securities
  
$
25,738
    
$
(157
)
  
$
40,007
    
$
(327
)
  
$
65,745
    
$
(484
)