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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 15,205 $ 12,337 $ 30,104 $ 21,153
Income tax benefit $ 3,377 $ 4,199 $ 6,662 $ 7,265