Goodwill and Related Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

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, 2013	$	195,520		$	145,654		$	—	$	341,174
Impairment	(14,235		)	(90,330		)	—		(104,565		)
Foreign currency translation	—			(565		)	—		(565		)
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

Schedule of Goodwill Impairment Tests

The following table summarizes the WACC calculation ranges used during the annual goodwill impairment tests performed during 2015 and 2014:

Date of Impairment Test	WACC
October 31, 2015	11.3% to 13.1%
October 31, 2014	12.9% to 13.6%

Schedule of Acquired Intangible Assets

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

	December 31, 2015				December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Estimated Useful Life
Indefinite-lived intangible assets:
Trademarks	$	50,538	$	—	$	42,720	$	—	Indefinite
Finite-lived intangible assets:
Trademarks	5,861		1,884		3,886		1,827		5 to 15 Years
Unpatented technology	28,072		10,656		24,527		8,768		5 to 20 Years
Customer relationships	85,419		35,673		52,974		31,554		5 to 17 Years
Non-compete agreements	3,107		1,771		1,807		1,550		4 to 10 Years
Backlog	6,480		6,480		1,330		1,330		.5 to 2 Years
	128,939		56,464		84,524		45,029
Total acquired intangible assets	$	179,477	$	56,464	$	127,244	$	45,029

Schedule of Acquired Intangible Asset Amortization Expense

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

	2015		2014		2013
Residential Products	$	440	$	1,200	$	1,454
Industrial and Infrastructure Products	4,423		2,205		1,000
Impairment charges	$	4,863	$	3,405	$	2,454

Schedule of Intangible Assets Amortization Expense

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

	2015		2014		2013
Amortization expense	$	12,679	$	5,720	$	6,572

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):

2016	$	8,604
2017	$	8,272
2018	$	7,715
2019	$	7,044
2020	$	6,532