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NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
NONCONTROLLING INTERESTS    
Noncontrolling interests attributable to joint ventures formed for water-related services $ 2,002 $ 2,674
Noncontrolling interests attributable to holders of Class B Common Stock 110,819 172,961
Total noncontrolling interests $ 112,821 $ 175,635