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BASIC AND DILUTED NET INCOME PER SHARE (Narrative) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2019
Antidilutive securities excluded from computation of earnings per share, amount 495,975 1,175,311 1,880,018  
Shares underlying the conversion option of the Convertible Notes that are not considered in the calculation of diluted net income per share 3,600,000      
Convertible Senior Note [Member]        
Conversion price $ 157.53     $ 6.3478