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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 6,755 $ 7,179 $ 21,677 $ 18,831
Income tax benefit (1,327) (1,388) (3,861) (3,617)
Share-based compensation expense, net of tax 5,428 5,791 17,816 15,214
Stock option and stock purchase plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,511 1,917 4,986 5,688
Unvested stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 5,244 $ 5,262 $ 16,691 $ 13,143