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SHARE-BASED AWARDS AND OPTIONS - Share-Based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement [Abstract]        
Share-based compensation expense $ 16,496 $ 15,205 $ 27,914 $ 30,104
Income tax benefit $ 3,728 $ 3,377 $ 6,237 $ 6,662