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SIGNIFICANT ACCOUNTING POLICIES - Other Liabilities (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Minimum      
Significant accounting policies      
Discount rate 6.30% 6.40% 6.40%
Projected increase rate in compensation 22.10% 10.00% 10.00%
Maximum      
Significant accounting policies      
Discount rate 12.70% 15.00% 15.20%
Projected increase rate in compensation 50.90% 48.30% 31.20%