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SEGMENT INFORMATION - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Five largest customers | Customer risk | Revenue from Contract with Customer        
Revenue, Major Customer [Line Items]        
Concentration risk 16.00% 17.00% 16.00% 16.00%