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SHARE-BASED AWARDS AND STOCK OPTIONS - Share-Based Compensation Expense and Income Tax Benefit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]        
Share-based compensation expense $ 27,877 $ 14,833 $ 55,791 $ 44,937
Income tax benefit $ 4,396 $ 3,614 $ 10,633 $ 10,276