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REVENUE (Details) $ in Thousands	3 Months Ended								12 Months Ended			36 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) region segment	Dec. 31, 2019 USD ($) region segment	Dec. 31, 2018 USD ($) region segment	Dec. 31, 2020 USD ($) segment
REVENUE
Number of Reportable Segments | segment									3	3	3	3
Contract liability	$ 8,200								$ 8,200			$ 8,200
Revenue	$ 133,339	$ 101,242	$ 92,239	$ 278,285	$ 276,088	$ 328,968	$ 323,887	$ 362,646	605,105	$ 1,291,589	$ 1,528,930
Permian Basin
REVENUE
Revenue									278,439	610,528	606,591
Haynesville/E. Texas
REVENUE
Revenue									73,116	73,658	59,969
Eagle Ford
REVENUE
Revenue									69,440	156,621	171,942
MidCon
REVENUE
Revenue									56,687	176,216	243,524
Marcellus/Utica
REVENUE
Revenue									54,473	96,454	134,984
Bakken
REVENUE
Revenue									38,986	92,956	153,212
Rockies
REVENUE
Revenue									37,517	85,339	111,901
Eliminations and other regions
REVENUE
Revenue									$ (3,553)	$ (183)	$ 46,807
Permian Basin, MidCon and Eagle Ford | Water Services
REVENUE
Number of revenue producing regions | region									3	3	3
Percentage of revenue									71.00%	72.00%	67.00%
Permian Basin and Bakken | Water Infrastructure
REVENUE
Percentage of revenue									88.00%	84.00%	85.00%
Permian Basin and MidCon | Oilfield Chemicals
REVENUE
Number of revenue producing regions | region									3	3	3
Percentage of revenue									87.00%	89.00%	83.00%

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