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Goodwill and Related Intangible Assets (Tables) | 12 Months Ended
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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 |

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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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