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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 9,617 $ 8,688 $ 30,771 $ 26,060
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     27,600 22,200
Share-based compensation expense 8,600 $ 8,000 27,700 $ 24,300
Compensation not yet recognized $ 53,200   $ 53,200  
Total unrecognized compensation cost, weighted average period     2 years 29 days