XML 26 R12.htm IDEA: XBRL DOCUMENT v3.8.0.1
SHORT-TERM AND LONG-TERM INVESTMENTS
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
SHORT-TERM AND LONG-TERM INVESTMENTS
NOTE 3:-
SHORT-TERM AND LONG-TERM INVESTMENTS

Short-term and long-term investments include marketable securities in the amount of $196,771 and $129,013 as of December 31, 2017 and 2016, respectively.

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 and 2016:
 
   
Amortized cost
    
Gross unrealized gains
    
Gross unrealized losses
    
Estimated fair value (Level 2 within the fair value hierarchy)
  
   
December 31,
    
December 31,
    
December 31,
    
December 31,
  
   
2017
    
2016
    
2017
    
2016
    
2017
    
2016
    
2017
    
2016
  
                                                 
Corporate debentures
  
$
189,836
    
$
122,335
    
$
9
    
$
91
    
$
908
    
$
225
    
$
188,937
    
$
122,201
  
U.S. Treasuries
    
7,007
      
7,008
      
-
      
-
      
170
      
196
      
6,837
      
6,812
  
U.S. Government Agencies
    
998
      
-
      
-
      
-
      
1
      
-
      
997
      
-
  
                                                                 
   
$
197,841
    
$
129,343
    
$
9
    
$
91
    
$
1,079
    
$
421
    
$
196,771
    
$
129,013
  

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

   
Amortized
    
Estimated
  
   
cost
    
fair value
  
             
Due within one year
  
$
64,055
    
$
63,951
  
Due after one year through five years
    
133,786
      
132,820
  
                 
   
$
197,841
    
$
196,771
  

Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2017 and 2016 were as indicated in the following tables:

   
December 31, 2017
  
   
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
  
                                     
Corporate debentures
  
$
135,252
    
$
(711
)
  
$
49,076
    
$
(198
)
  
$
184,328
    
$
(909
)
U.S. treasuries
    
-
      
-
      
6,837
      
(170
)
    
6,837
      
(170
)
U.S. Government agencies
    
997
      
-
      
-
      
-
      
997
      
-
  
                                                 
   
$
136,249
    
$
(711
)
  
$
55,913
    
$
(368
)
  
$
192,162
    
$
(1,079
)

   
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
  
                                     
Corporate debentures
  
$
19,444
    
$
(137
)
  
$
56,799
    
$
(88
)
  
$
76,243
    
$
(225
)
U.S. treasuries
    
-
      
-
      
6,812
      
(196
)
    
6,812
      
(196
)
                                                 
   
$
19,444
    
$
(137
)
  
$
63,611
    
$
(284
)
  
$
83,055
    
$
(421
)