GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

GOODWILL AND OTHER INTANGIBLE ASSETS.

Schedule of changes in the carrying amounts of goodwill by reportable segment

	Water		Oilfield		Wellsite
	Solutions		Chemicals		Services		Total
	(in thousands)
Balance as of December 31, 2015	$	137,534	$	—	$	13,237	$	150,771
Impairment		(137,534)		—		(995)		(138,529)
Balance as of December 31, 2016		—		—		12,242		12,242
Additions		245,542		15,637		—		261,179
Balance as of December 31, 2017	$	245,542	$	15,637	$	12,242	$	273,421

Summary of components of other intangible assets

	As of December 31, 2017						As of December 31, 2016
	Gross		Accumulated		Net		Gross		Accumulated		Net
	Value		Amortization		Value		Value		Amortization		Value
	(in thousands)						(in thousands)
Customer relationships	$	169,250	$	57,836	$	111,414	$	56,826	$	48,236	$	8,590
Patents and trademarks		33,544		414		33,130		369		142		227
Other		14,704		3,182		11,522		5,122		2,353		2,769
Total other intangible assets	$	217,498	$	61,432	$	156,066	$	62,317	$	50,731	$	11,586

Summary of future estimated amortization expense for other intangible assets

Year Ending December 31,	Amount
	(in thousands)
2018	$	13,028
2019		11,587
2020		11,268
2021		10,111
2022		9,898
Thereafter		71,458