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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 8,389 $ 6,755 $ 19,019 $ 21,677
Income tax benefit (1,470) (1,327) (2,955) (3,861)
Share-based compensation expense, net of tax 6,919 5,428 16,064 17,816
Stock option and stock purchase plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,052 1,511 3,461 4,986
Unvested stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 7,337 $ 5,244 $ 15,558 $ 16,691