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SHARE-BASED COMPENSATION - Summary of SAR activity (Details) - Share appreciation rights - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 533 537
Grants (in shares) 304 292
Exercises (in shares) (36) (158)
Forfeited (in shares) (127) (138)
Number of units, end of period (in shares) 674 533