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RELATED PARTY TRANSACTIONS (Compensation expense recognized for key management personnel) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Related Party [Abstract]    
Short-term employee benefits $ 9,446 $ 7,422
Post-employment benefits 205 157
Share-based payments 10,932 10,132
Key management personnel compensation $ 20,583 $ 17,711