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

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