Goodwill and Related Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The changes in the carrying amount of goodwill for the six months ended June 30, 2019 are as follows (in thousands):



	Residential Products		Industrial and Infrastructure Products		Renewable Energy & Conservation			Total
Balance at December 31, 2018	$	198,075	$	53,769	$	71,827		$	323,671
Adjustments to prior year acquisitions	—		—		(172		)	(172		)
Foreign currency translation	—		229		291			520
Balance at June 30, 2019	$	198,075	$	53,998	$	71,946		$	324,019

Acquired Intangible Assets

Acquired intangible assets consist of the following (in thousands):



	June 30, 2019				December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Life
Indefinite-lived intangible assets:
Trademarks	$	43,870	$	—	$	43,870	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	6,134		3,820		6,094		3,518		3 to 15 Years
Unpatented technology	28,644		14,823		28,644		13,881		5 to 20 Years
Customer relationships	70,690		38,053		70,419		35,678		5 to 17 Years
Non-compete agreements	1,649		1,361		1,649		1,224		4 to 10 Years
	107,117		58,057		106,806		54,301
Total acquired intangible assets	$	150,987	$	58,057	$	150,676	$	54,301

The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Amortization expense	$	1,797	$	2,148	$	3,594	$	4,287

Amortization expense related to acquired intangible assets for the remainder of fiscal 2019 and the next five years thereafter is estimated as follows (in thousands):



	2019		2020		2021		2022		2023		2024
Amortization expense	$	3,593	$	6,894	$	6,700	$	6,221	$	5,683	$	5,428