GOODWILL AND INTANGIBLE ASSETS, NET (Tables)

12 Months Ended

Dec. 31, 2017

GOODWILL AND INTANGIBLE ASSETS, NET [Abstract]

Summary of Intangible Assets by Major Class

The following table summarizes the gross carrying amounts and accumulated amortization of intangible assets by major class (in thousands):

	December 31, 2017
Intangible assets subject to amortization (Definite-lived)	Gross		Accumulated Amortization			Net
Customer relationships	$	16,852	$	(3,651	)	$	13,201
Non-compete agreements		94		(61	)		33
Licenses and permits		1,471		(390	)		1,081
Developed technology		6,131		(1,993	)		4,138
		24,548		(6,095	)		18,453
Intangible assets not subject to amortization (Indefinite-lived)
Emissions Allowance		197		-			197
Trade name		2,158		-			2,158
Total	$	26,903	$	(6,095	)	$	20,808

	December 31, 2016
Intangible assets subject to amortization (Definite-lived)	Gross		Accumulated Amortization			Net
Customer relationships	$	16,852	$	(2,527	)	$	14,325
Non-compete agreements		94		(43	)		51
Licenses and permits		1,471		(285	)		1,186
Developed technology		6,131		(1,379	)		4,752
		24,548		(4,234	)		20,314
Intangible assets not subject to amortization (Indefinite-lived)
Emissions Allowance		197		-			197
Trade name		2,158		-			2,158
Total	$	26,903	$	(4,234	)	$	22,669

Estimated Amortization Expenses for Succeeding Five Fiscal Years

Based on identified intangible assets that are subject to amortization as of December 31, 2017, we expect future amortization expenses for each period to be as follows (in thousands):

	Total		2018		2019		2020		2021		2022		Thereafter
Customer relationships	$	13,202	$	1,123	$	1,123	$	1,123	$	1,123	$	1,123	$	7,587
Non-compete agreements		32		19		13		-		-		-		-
Licenses and permits		1,081		106		106		106		106		86		571
Developed technology		4,138		613		613		613		613		613		1,073
Total future amortization expense	$	18,453	$	1,861	$	1,855	$	1,842	$	1,842	$	1,822	$	9,231