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EARNINGS PER SHARE - Schedule of Antidilutive and Contingently Issuable Shares (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based awards excluded from diluted EPS 4,532 3,002 4,294 2,579
Performance-based restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contingently issuable awards excluded from diluted EPS (in shares) 0 63 0 70
Performance-based restricted stock awards with a market condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contingently issuable awards excluded from diluted EPS (in shares) 315 399 315 431
Convertible shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based awards excluded from diluted EPS 2,900   2,900  
Time-based options and restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive awards excluded from diluted EPS (in shares) 2,934 2,540 3,070 2,078
Performance-based restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive awards excluded from diluted EPS (in shares) 1,283 0 909 0