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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 16,496 $ 15,205 $ 27,914 $ 30,104
Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 900   1,600 1,500
Aggregate intrinsic value of stock options exercised     18,900 $ 4,600
Total unrecognized compensation cost $ 6,000   $ 6,000  
Weighted-average period of unrecognized compensation cost     2 years 2 months 12 days  
Weighted average grant date fair value for each option granted (USD per share) $ 39.60 $ 35.09 $ 39.60 $ 35.09