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ACCOUNTING POLICIES - Concentration (Details) - Minimum
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues | Customer concentration risk      
Concentrations      
Percentage for concentration of credit risk disclosure 4.00% 4.00% 4.00%
Accounts receivable | Credit concentration risk      
Concentrations      
Percentage for concentration of credit risk disclosure 7.00% 7.00%