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STOCK COMPENSATION - Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 1,420 $ 1,193 $ 2,746 $ 2,100
Equity based stock option expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 139 100 285 300
Restricted and performance-based stock awards expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 1,276 1,086 2,450 1,786
Equity based awards        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense 1,415 1,186 2,735 2,086
Liability based stock option expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock compensation expense $ 5 $ 7 $ 11 $ 14