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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Number of shares reserved for future grants 817,511    
Unrecognized share based compensation expense $ 141,029    
Unrecognized share based compensation expense recognition period 2 years 6 months 3 days    
Expected dividend yield 0.00% 0.00% 0.00%
Total fair value of RSUs and PSUs vested $ 67,737 $ 23,762 $ 12,547