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Goodwill and Related Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
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 |  | Total
Balance at December 31, 2012 | $ | 193,043 |  |  | $ | 166,820 |  |  | $ | 359,863 |
Acquired goodwill | 2,467 |  |  | — |  |  | 2,467 |
Adjustments to prior year acquisitions | 10 |  |  | 242 |  |  | 252 |
Impairment | — |  |  | (21,040 | ) |  | (21,040 | )
Foreign currency translation | $ | — |  |  | $ | (368 | ) |  | (368 | )
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 |
Schedule of Goodwill Impairment Tests | The following table summarizes the WACC calculation ranges used during the annual goodwill impairment tests performed during 2014 and 2013:
Date of Impairment Test |  | WACC
October 31, 2014 |  | 12.9% to 13.6%
October 31, 2013 |  | 11.1% to 12.7%
Schedule of Acquired Intangible Assets | Acquired intangible assets consist of the following (in thousands):
| December 31, 2014 |  | December 31, 2013 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  | Estimated Useful Life
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 42,720 |  |  | $ | — |  |  | $ | 45,724 |  |  | $ | — |  |  | Indefinite
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 3,886 |  |  | 1,827 |  |  | 3,989 |  |  | 1,420 |  |  | 2 to 15 Years
Unpatented technology | 24,527 |  |  | 8,768 |  |  | 24,690 |  |  | 6,980 |  |  | 5 to 20 Years
Customer relationships | 52,974 |  |  | 31,554 |  |  | 54,171 |  |  | 28,926 |  |  | 5 to 16 Years
Non-compete agreements | 1,807 |  |  | 1,550 |  |  | 1,937 |  |  | 1,408 |  |  | 4 to 10 Years
Backlog | 1,330 |  |  | 1,330 |  |  | 1,330 |  |  | 1,330 |  |  | 1 to 2 Years
| 84,524 |  |  | 45,029 |  |  | 86,117 |  |  | 40,064 |  |  |
Total acquired intangible assets | $ | 127,244 |  |  | $ | 45,029 |  |  | $ | 131,841 |  |  | $ | 40,064 |  |  |
Schedule of Acquired Intangible Asset Amortization Expense | The following table summarizes the impairment charges for the years ended December 31 (in thousands):
| 2014 |  | 2013 |  | 2012
Residential Products | $ | 1,200 |  |  | $ | 1,454 |  |  | $ | 300 |
Industrial and Infrastructure Products | 2,205 |  |  | 1,000 |  |  | — |
Impairment charges | $ | 3,405 |  |  | $ | 2,454 |  |  | $ | 300 |
Schedule of Intangible Assets Amortization Expense | The following table summarizes amortization expense for the years ended December 31 (in thousands):
| 2014 |  | 2013 |  | 2012
Amortization expense | $ | 5,720 |  |  | $ | 6,572 |  |  | $ | 6,671 |
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):
2015 | $ | 5,488 |
2016 | $ | 5,154 |
2017 | $ | 4,793 |
2018 | $ | 4,231 |
2019 | $ | 3,561 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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