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REVENUE (Details)
$ in Thousands
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2019
USD ($)
region
Jun. 30, 2018
USD ($)
region
Jun. 30, 2019
USD ($)
region
Jun. 30, 2018
USD ($)
region
Jun. 30, 2019
region
REVENUE          
Revenue $ 323,887 $ 393,247 $ 686,533 $ 769,642  
Permian Basin          
REVENUE          
Revenue 148,118 154,422 310,783 282,783  
MidCon          
REVENUE          
Revenue 48,515 67,425 106,978 129,024  
Eagle Ford          
REVENUE          
Revenue 41,033 42,486 79,759 89,028  
Bakken          
REVENUE          
Revenue 20,361 39,487 46,143 79,261  
Marcellus/Utica          
REVENUE          
Revenue 28,292 34,533 58,451 69,019  
Rockies          
REVENUE          
Revenue 21,494 28,221 43,936 62,680  
Haynesville/E. Texas          
REVENUE          
Revenue 18,314 13,129 35,596 30,009  
All other          
REVENUE          
Revenue $ (2,240) $ 13,544 $ 4,887 $ 27,838  
Permian Basin, MidCon and Eagle Ford | Water services          
REVENUE          
Number of revenue producing regions | region 3 3 3 3  
Percentage of revenue 74.00% 73.00% 74.00% 70.00%  
Permian Basin and Bakken | Water infrastructure          
REVENUE          
Number of revenue producing regions | region         2
Percentage of revenue 81.00% 82.00% 82.00% 83.00%  
Permian Basin and MidCon | Oilfield chemicals          
REVENUE          
Number of revenue producing regions | region         2
Percentage of revenue 75.00% 78.00% 76.00% 74.00%