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NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
NONCONTROLLING INTERESTS    
Noncontrolling interests attributable to joint ventures formed for water-related services $ 2,723 $ 3,273
Noncontrolling interests attributable to holders of Class B Common Stock 275,487 274,566
Total noncontrolling interests $ 278,210 $ 277,839