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STOCK COMPENSATION - Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock compensation expense $ 1,444 $ 1,326
Equity based stock option expense    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock compensation expense 124 146
Restricted and performance-based stock awards expense    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock compensation expense 1,315 1,174
Equity based awards    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock compensation expense 1,439 1,320
Liability based stock option expense    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock compensation expense $ 5 $ 6