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STOCKHOLDERS' EQUITY (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 13 Months Ended
Mar. 31, 2021
USD ($)
Apr. 30, 2019
shares
Mar. 31, 2019
shares
Sep. 30, 2018
shares
Feb. 27, 2017
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
shares
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Mar. 31, 2021
₪ / shares
May 21, 2020
USD ($)
Amount authorized for repurchase of ordinary shares | $                           $ 25,000
Treasury stock acquired | shares           2,662,125 2,662,125   2,507,314          
Percentage of outstanding stock in treasury stock           11.30%     10.70%          
Dividend paid | $         $ 5,000 $ 4,918 $ 14,940 $ 15,366   $ 5,000 $ 20,000 $ 20,200    
Stcok repurchased by subsidiary, shares | shares             227,828              
Stcok repurchased by subsidiary, amount | $ [1]             $ 6,001              
Road Track [Member]                            
Shares Issued during period | shares     373,489 373,489                    
Shares return due to downward transaction price | shares   300,472   300,472                    
Subsequent Event [Member]                            
Dividend paid | $ $ 10,000                          
Cash dividend declared, value per share | ₪ / shares                         ₪ 0.48  
Dividends payable date                         2019-04  
[1] See Note 14A5