Ameresco, Inc. Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

The changes in the carrying value of goodwill attributable to each reportable segment are as follows:



	U.S. Regions		U.S. Federal		Canada			Other			Total
Balance, December 31, 2016	$	24,759	$	3,375	$	3,262		$	26,580		$	57,976
Sale of assets of a business	—		—		—			(2,639		)	(2,639		)
Currency effects	—		—		232			566			798
Balance, December 31, 2017	24,759		3,375		3,494			24,507			56,135
Goodwill acquired during the year	1,611		1,234		—			—			2,845
Currency effects	—		—		(277		)	(371		)	(648		)
Balance, December 31, 2018	$	26,370	$	4,609	$	3,217		$	24,136		$	58,332
Accumulated Goodwill Impairment Balance, December 31, 2017	$	—	$	—	$	(1,016	)	$	—		$	(1,016	)
Accumulated Goodwill Impairment Balance, December 31, 2018	$	—	$	—	$	(1,016	)	$	—		$	(1,016	)

he gross carrying amount and accumulated amortization of intangible assets are as follows:

Amortization expense for the years ended December 31, 2018, 2017 and 2016 is as follows:



	Year Ended December 31,
	2018		2017		2016
Customer contracts	$	30	$	31	$	184
Customer relationships	973		1,244		1,809
Non-compete agreements	3		42		116
Technology	47		128		238
Trade names	4		6		11
Total intangible amortization expense	$	1,057	$	1,451	$	2,358

Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years is as follows:



	Estimated Amortization
	Included in Selling, General and Administrative Expenses
2019	$	844
2020	620
2021	247
2022	75
2023	66
Thereafter	152
	$	2,004