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SHARE-BASED COMPENSATION PLANS - Share-Based Compensation Expense and Income Tax Benefits Recognized During the Periods (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 12,705 $ 8,389 $ 35,999 $ 19,019
Income tax benefit (1,695) (1,470) (5,208) (2,955)
Share-based compensation expense, net of tax 11,010 6,919 30,791 16,064
Stock option and stock purchase plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 593 1,052 2,230 3,461
Unvested stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 12,112 $ 7,337 $ 33,769 $ 15,558