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EMPLOYEE STOCK COMPENSATION - Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 5,781 $ 5,039 $ 6,565
Related tax benefits 1,703 1,481 1,929
Stock option awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 4 (8) 174
Restricted stock awards and restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 5,777 $ 5,047 $ 6,391