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SHAREHOLDERS' EQUITY (Description of Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Nov. 30, 2020
Apr. 11, 2019
Dec. 31, 2010
Oct. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash dividend declare per share     $ 0.36 $ 0.45    
Dividend payable     $ 19,999 $ 24,864    
Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash dividend declare per share   $ 0.63        
Dividend payable   $ 35,003        
Second Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested percentage 50.00%          
Third and Fourth Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested percentage 25.00%          
2008 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total number of shares authorized         6,015,500  
Shares available for grant 200,388       7,015,500 1,000,000
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period for plan 3 years          
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period for plan 4 years          
Option One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 6 years          
Option Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 7 years          
Option Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 10 years