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ACQUISITIONS - Resource Water Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 15, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ACQUISITION        
Goodwill   $ 275,795 $ 273,421 $ 12,242
Resource Water Acquisition        
ACQUISITION        
Miles of layflat hose 24      
Total consideration paid $ 8,966      
Cash paid $ 6,586      
Class A Common stock issued, Share Price $ 15.17      
Cash on hand $ 6,600      
Goodwill 1,894      
Resource Water Acquisition | Class A Common Stock        
ACQUISITION        
Common stock issued $ 2,380