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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract]  
Schedule of Recurring Fair Value Measurements
Recurring Fair Value Measurements Using the Indicated Inputs:

   
December 31,
2018
    
Quoted prices in active market for identical liability (Level 1)
    
Significant other observable inputs
(Level 2)
    
Significant unobservable inputs
(Level 3)
  
Cross currency swap - asset, net position
  
$
4,951
    
$
--
    
$
4,951
    
$
--
  
Marketable securities held for sale
    
135,227
      
135,227
      
--
      
--
  
Foreign exchange forward and cylinders - liability position
    
(395
)
    
--
      
(395
)
    
--
  
   
$
139,783
    
$
135,227
    
$
4,556
    
$
--
  
 
   
December 31,
2017
    
Quoted prices in active market for identical liability (Level 1)
    
Significant other observable inputs
(Level 2)
    
Significant unobservable inputs
(Level 3)
  
Cross currency swap - asset, net position
  
$
16,455
    
$
--
    
$
16,455
    
$
--
  
Marketable securities held for sale
    
113,168
      
113,168
      
--
      
--
  
Foreign exchange forward and cylinders - liability position
    
(169
)
    
--
      
(169
)
    
--
  
Foreign exchange forward and cylinders - asset position
    
24
      
--
      
24
      
--
  
   
$
129,478
    
$
113,168
    
$
16,310
    
$
--
  
Schedule of Marketable Securities
The following table summarizes amortized costs, gross unrealized gains and losses and estimated fair values of available-for-sale marketable securities as of December 31, 2018:

   
Amortized cost
    
Gross unrealized
gains
    
Gross
Unrealized
losses
    
Estimated
fair value
  
Corporate bonds
  
$
111,639
    
$
29
    
$
(2,029
)
   $
109,639
  
U.S government bonds
    
5,444
      
21
      
--
      
5,465
  
Non-U.S government bonds
    
2,456
      
--
      
(33
)
    
2,423
  
Municipal bonds
    
2,248
      
--
      
(13
)
    
2,235
  
Money market fund
    
15,225
      
--
      
--
      
15,225
  
Certificate of deposits
    
248
      
--
      
(8
)
    
240
  
 
  
$
137,260
    
$
50
    
$
(2,083
)
  
$
135,227
  
The following table summarizes amortized costs, gross unrealized gains and losses and estimated fair values of available-for-sale marketable securities as of December 31, 2017:

   
Amortized cost
    
Gross unrealized
gains
    
Gross
Unrealized
losses
    
Estimated
fair value
  
Corporate bonds
  
$
98,998
    
$
25
    
$
(683
)
  
$
98,340
  
Non-U.S government bonds
    
2,730
      
--
      
(19
)
    
2,711
  
Municipal bonds
    
11,950
      
15
      
(96
)
    
11,869
  
Certificate of deposits
    
248
      
--
      
--
      
248
  
 
  
$
113,926
    
$
40
    
$
(798
)
  
$
113,168
  
Schedule of Maturities of Marketable Securities
The scheduled maturities of available-for-sale marketable securities as of December 31, 2018 were as follows:

 
  
Amortized cost
    
Estimated fair value
  
Due within one year
  
$
16,686
    
$
16,661
  
Due after one year through five years
    
120,574
      
118,566
  
   
$
137,260
    
$
135,227
  

The scheduled maturities of available-for-sale marketable securities as of December 31, 2017 were as follows:

 
  
Amortized cost
    
Estimated fair value
  
Due within one year
  
$
7,688
    
$
7,679
  
Due after one year through five years
    
106,238
      
105,489
  
   
$
113,926
    
$
113,168
  
Schedule of Investments with Continuous Unrealized Losses
Investments with continuous unrealized losses for less than 12 months and 12 months or more and their related fair values as of December 31, 2018, were as indicated in the following tables:
 
   
December 31, 2018
  
   
Investment 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
  
Corporate debentures
  
$
19,716
    
$
(140
)
  
$
79,609
    
$
(1,889
)
  
$
99,325
    
$
(2,029
)
Non-U.S government bonds
    
963
      
--
      
1,460
      
(33
)
    
2,423
      
(33
)
Municipal bonds
    
2,235
      
(13
)
    
--
      
--
      
2,235
      
(13
)
Certificate of deposits
    
--
      
--
      
240
      
(8
)
    
240
      
(8
)
Total
  
$
22,914
    
$
(153
)
  
$
81,309
    
$
(1,930
)
  
$
104,223
    
$
(2,083
)
 
Investments with continuous unrealized losses for less than 12 months and 12 months or more and their related fair values as of December 31, 2017, were as indicated in the following tables:
 
   
December 31, 2017
  
   
Investment 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
  
Corporate debentures
  
$
89,133
    
$
(683
)
  
$
--
    
$
--
    
$
89,133
    
$
(683
)
Non-U.S government bonds
    
2,711
      
(19
)
    
--
      
--
      
2,711
      
(19
)
Municipal bonds
    
8,837
      
(96
)
    
--
      
--
      
8,837
      
(96
)
Total
  
$
100,681
    
$
(798
)
  
$
--
    
$
--
    
$
100,681
    
$
(798
)