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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
SEGMENT INFORMATION
Number of operating segments | segment			3
Number of reportable segments | segment			3
Segment information
Revenue	$ 323,887	$ 393,247	$ 686,533	$ 769,642
Income (loss) before taxes	8,639	25,173	10,217	41,767
Depreciation and Amortization	29,749	31,252	62,267	62,675
Capital Expenditures	23,166	45,819	54,811	76,925
Income from operations	11,179	24,795	17,812	43,398
Other (expense) income, net	(59)	4	210	100
Water services
Segment information
Revenue	202,011	233,954	422,606	452,184
Water infrastructure
Segment information
Revenue	51,710	55,727	105,326	109,784
Oilfield chemicals
Segment information
Revenue	63,001	64,807	129,830	128,437
Other
Segment information
Revenue	7,165	38,759	28,771	79,237
Operating segment | Water services
Segment information
Revenue	202,997	234,040	423,877	452,395
Income (loss) before taxes	16,234	27,039	39,894	49,757
Depreciation and Amortization	21,024	18,947	42,286	37,839
Capital Expenditures	9,489	33,321	22,615	51,218
Operating segment | Water infrastructure
Segment information
Revenue	51,719	55,733	105,335	109,790
Income (loss) before taxes	3,202	7,030	7,003	12,779
Depreciation and Amortization	6,072	5,219	12,161	10,256
Capital Expenditures	11,542	7,214	28,780	14,650
Operating segment | Oilfield chemicals
Segment information
Revenue	62,997	64,842	130,116	128,472
Income (loss) before taxes	4,424	1,031	6,437	1,962
Depreciation and Amortization	1,747	2,823	4,200	5,738
Capital Expenditures	2,132	3,424	3,352	5,679
Operating segment | Other
Segment information
Revenue	9,403	39,343	33,073	80,167
Income (loss) before taxes	673	911	(5,850)	(58)
Depreciation and Amortization		3,456	1,714	7,494
Capital Expenditures	3	1,860	64	5,378
Elimination
Segment information
Revenue	(3,229)	(711)	(5,868)	(1,182)
Corporate
Segment information
Income (loss) before taxes	(13,354)	(11,216)	(29,672)	(21,042)
Depreciation and Amortization	906	807	1,906	1,348
Material reconciling items
Segment information
Income from operations	24,533	36,011	47,484	64,440
Interest expense, net	(839)	(1,342)	(1,932)	(2,493)
Other (expense) income, net	$ (1,701)	$ 1,720	$ (5,663)	$ 862

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