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STOCK-BASED COMPENSATION (Equity Plans) (Details) - shares
Jun. 08, 2021
Jun. 11, 2015
Jan. 11, 2012
Dec. 31, 2021
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance (in shares) 900,000      
Maximum salary contribution, percent 10.00%      
Offering period 6 months      
ESPP purchase price of common stock, percent of market price 85.00%      
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (in shares)       4,266,000
Expiration period   10 years    
2012 Directors Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance (in shares)       522,000
Expiration period     10 years  
Number of shares authorized for issuance (in shares)     600,000  
2012 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period     10 years