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STOCK-BASED COMPENSATION - Restricted Stock Units (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock-based compensation  
Period for recognition (in years) 3 years
Grants in period, intrinsic value (in dollars per share) | $ / shares $ 34
Minimum  
Stock-based compensation  
Award vesting rights, percentage 0.00%
Maximum  
Stock-based compensation  
Award vesting rights, percentage 200.00%
LTIP Program | Restricted Stock Units (RSUs)  
Stock-based compensation  
Granted (in shares) 124,780
Forfeited (in shares) 0