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MARKETABLE SECURITIES (Schedule of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available for-sale - matures within one year, amortized cost   $ 119,247
Available for-sale - matures within one year, gross unrealized gains  
Available for-sale - matures within one year, gross unrealized losses   (567)
Available for-sale - matures within one year, fair value   118,680
Available for-sale - matures after one year, amortized cost $ 119,090  
Available for-sale - matures after one year, gross unrealized gains 336  
Available for-sale - matures after one year, gross unrealized losses (250)  
Available for-sale - matures after one year, fair value 119,176  
Amortized cost 210,767 193,811
Gross unrealized gains 532
Gross unrealized losses (278) (875)
Fair value 211,021 192,936
Corporate bonds [Member]    
Available for-sale - matures within one year, amortized cost 91,677 110,904
Available for-sale - matures within one year, gross unrealized gains 196
Available for-sale - matures within one year, gross unrealized losses (28) (519)
Available for-sale - matures within one year, fair value 91,845 110,385
Available for-sale - matures after one year, amortized cost 117,692 74,564
Available for-sale - matures after one year, gross unrealized gains 336
Available for-sale - matures after one year, gross unrealized losses (250) (308)
Available for-sale - matures after one year, fair value 117,778 74,256
Governmental bonds [Member]    
Available for-sale - matures within one year, amortized cost   8,343
Available for-sale - matures within one year, gross unrealized gains  
Available for-sale - matures within one year, gross unrealized losses   (48)
Available for-sale - matures within one year, fair value   $ 8,295
Available for-sale - matures after one year, amortized cost 1,398  
Available for-sale - matures after one year, gross unrealized gains  
Available for-sale - matures after one year, gross unrealized losses  
Available for-sale - matures after one year, fair value $ 1,398