Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill for the years ended December 31, 2014 and December 31, 2013 are as follows:



	U.S. Residential Products		U.S. Commercial Products		European Roll Coated Aluminum			European Engineered Products			Consolidated
Balance at December 31, 2012	$	72,243	$	9,067	$	105,165		$	12,900		$	199,375
Acquisition of Cleveland Tubing, Inc.	48		—		—			—			48
Foreign currency translation	—		—		4,384			246			4,630
Balance at December 31, 2013	72,291		9,067		109,549			13,146			204,053
Foreign currency translation	—		—		(13,119		)	(776		)	(13,895		)
Balance at December 31, 2014	$	72,291	$	9,067	$	96,430		$	12,370		$	190,158

Intangible Assets

Intangible assets consisted of the following:



	As of December 31, 2014							As of December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Intangible assets subject to amortization:
Customer relationships	$	205,760	$	(179,445	)	$	26,315	$	215,922	$	(175,291	)	$	40,631
Patents	5,994		(5,599		)	395		5,993		(5,020		)	973
	211,754		(185,044		)	26,710		221,915		(180,311		)	41,604
Intangible assets not subject to amortization:
Trade names	6,100		—			6,100		6,100		—			6,100
Total intangible assets	$	217,854	$	(185,044	)	$	32,810	$	228,015	$	(180,311	)	$	47,704

Future Amortization Expense

The aggregate amortization expense for intangible assets for 2014, 2013, and 2012 was $13.5 million, $15.2 million, and $16.1 million, respectively. The average useful lives of the Company's customer relationships and patents are 12 years and 10 years, respectively. Based on the carrying value of identified intangible assets recorded at December 31, 2014, and assuming no subsequent impairment of the underlying assets, the aggregate annual amortization expense for the next 5 years is expected to be as follows:



	Amortization of Intangible Assets
2015	$	11,919
2016	10,597
2017	4,446
2018	497
2019	192