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SHARE-BASED AWARDS AND OPTIONS - Share-Based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Share-based compensation expense $ 14,898 $ 8,816
Income tax benefit $ 3,285 $ 3,065