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STOCK-BASED COMPENSATION - Compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
STOCK-BASED COMPENSATION        
Pre-tax expense $ 1,471 $ 5,207 $ 4,481 $ 9,321
After tax expense $ 1,103 $ 3,419 $ 3,360 $ 6,525