Goodwill and Related Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31 were as follows (in thousands):

	Residential Products		Industrial and Infrastructure Products			Renewable Energy and Conservation			Total
Balance at December 31, 2014	$	181,285	$	54,759		$	—		$	236,044
Acquired goodwill	—		—			57,180			57,180
Foreign currency translation	—		(1,055		)	221			(834		)
Balance at December 31, 2015	$	181,285	$	53,704		$	57,401		$	292,390
Acquired goodwill	—		—			12,283			12,283
Impairment	—		—			(929		)	(929		)
Foreign currency translation	—		180			108			288
Balance at December 31, 2016	$	181,285	$	53,884		$	68,863		$	304,032

Schedule of Goodwill Impairment Tests

The following table summarizes the WACC calculation ranges used during the annual goodwill impairment tests performed during 2016 and 2015:

	Residential and I&I Products Segments	Renewable Energy & Conservation Segment
	All Reporting Units	Greenhouse Reporting Unit	Solar Reporting Unit
Date of Impairment Test	WACC	WACC	WACC
October 31, 2016	12.4% to 13.0%	15.1%	16.1%
October 31, 2015	11.3% to 13.1%	*nmf	*nmf

*nmf - For the October 31, 2015 annual impairment test, the Company performed a qualitative test vs. a quantitative test for goodwill impairment purposes. Therefore, a WACC percentage was not calculated for these reporting units.

Schedule of Acquired Intangible Assets

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

	December 31, 2016				December 31, 2015
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Useful Life
Indefinite-lived intangible assets:
Trademarks	$	44,720	$	—	$	50,538	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	5,808		2,427		5,861		1,884		5 to 15 Years
Unpatented technology	26,720		10,041		28,072		10,656		5 to 20 Years
Customer relationships	78,569		33,585		85,419		35,673		5 to 17 Years
Non-compete agreements	1,649		623		3,107		1,771		4 to 10 Years
Backlog	900		900		6,480		6,480		.5 to 2 Years
	113,646		47,576		128,939		56,464
Total acquired intangible assets	$	158,366	$	47,576	$	179,477	$	56,464

Schedule of Acquired Intangible Asset Amortization Expense

The following table summarizes the impairment charges for the years ended December 31 (in thousands):

	2016				2015				2014
	Indefinite-lived intangibles		Definite-lived intangibles		Indefinite-lived intangibles		Definite-lived intangibles		Indefinite-lived intangibles		Definite-lived intangibles
Residential Products	$	—	$	—	$	440	$	—	$	1,200	$	—
Industrial and Infrastructure Products	7,980		—		4,423		—		1,500		705
Renewable Energy and Conservation	1,068		198		—		—		—		—
Impairment charges	$	9,048	$	198	$	4,863	$	—	$	2,700	$	705

Schedule of Intangible Assets Amortization Expense

The following table summarizes amortization expense for the years ended December 31 (in thousands):

	2016		2015		2014
Amortization expense	$	9,637	$	12,679	$	5,720

Schedule of Amortization Expense

Amortization expense related to acquired intangible assets for the next five years ended December 31 is estimated as follows (in thousands):

2017	$	8,500
2018	$	7,945
2019	$	7,273
2020	$	6,760
2021	$	6,159