SEGMENT INFORMATION - Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Assets	$ 1,043,828	$ 950,192
Operating segment | Water Services
Segment Reporting Information [Line Items]
Assets	549,298	533,071
Operating segment | Water Infrastructure
Segment Reporting Information [Line Items]
Assets	293,663	229,803
Operating segment | Oilfield Chemicals
Segment Reporting Information [Line Items]
Assets	191,006	180,732
Operating segment | Other.
Segment Reporting Information [Line Items]
Assets	$ 9,861	$ 6,586