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SIGNIFICANT ACCOUNTING POLICIES - Severance (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]    
Severance Costs $ 3,225 $ 7,168
Water Services    
Restructuring Cost and Reserve [Line Items]    
Severance Costs   2,929
Water Infrastructure    
Restructuring Cost and Reserve [Line Items]    
Severance Costs   452
Oilfield Chemicals    
Restructuring Cost and Reserve [Line Items]    
Severance Costs   626
Others    
Restructuring Cost and Reserve [Line Items]    
Severance Costs $ 3,225 $ 3,161