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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
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 7,399 $ 5,341
Income tax benefit (1,160) (1,161)
Share-based compensation expense, net of tax 6,239 4,180
Stock option and stock purchase plans    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1,819 1,875
Unvested stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 5,580 $ 3,466