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EMPLOYEE BENEFITS AND COMPENSATION OF KEY MANAGEMENT PERSONNEL (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
EMPLOYEE BENEFITS AND COMPENSATION OF KEY MANAGEMENT PERSONNEL    
Employee benefits expense $ 526,800 $ 479,100
Salaries, short-term incentives and other benefits 13,852 16,620
Post-employment benefits 1,928 1,489
Share-based payments 16,331 13,591
Total $ 32,111 $ 31,700