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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Goodwill      
Balance at the beginning of the period $ 273,801 $ 273,801 $ 273,421
Additions     982
Measurement period adjustment   133 17,292
Affirm crane business divestiture   2,604  
Impairment 0 (4,396) (17,894)
Balance at the end of the period   266,934 273,801
Oilfield chemicals      
Goodwill      
Balance at the beginning of the period     15,637
Measurement period adjustment     (2,985)
Impairment     (12,652)
Water Solutions      
Goodwill      
Balance at the beginning of the period 266,801 266,801 245,542
Additions     982
Resegmentation   (266,801)  
Measurement period adjustment     20,277
Balance at the end of the period     266,801
Wellsite Services      
Goodwill      
Balance at the beginning of the period $ 7,000 7,000 12,242
Resegmentation   (7,000)  
Impairment     (5,242)
Balance at the end of the period     $ 7,000
Water services      
Goodwill      
Resegmentation   186,335  
Measurement period adjustment   133  
Balance at the end of the period   186,468  
Water infrastructure      
Goodwill      
Resegmentation   80,466  
Balance at the end of the period   80,466  
Other      
Goodwill      
Resegmentation   7,000  
Affirm crane business divestiture   2,604  
Impairment   $ (4,396)