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SEGMENT INFORMATION - Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 875,359 $ 1,347,620
Operating segment | Water Services    
Segment Reporting Information [Line Items]    
Assets 515,856 831,123
Operating segment | Water Infrastructure    
Segment Reporting Information [Line Items]    
Assets 204,995 314,026
Operating segment | Oilfield Chemicals    
Segment Reporting Information [Line Items]    
Assets 147,612 192,224
Operating segment | Other    
Segment Reporting Information [Line Items]    
Assets $ 6,896 $ 10,247