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Goodwill and Related Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
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):
| Renewable Energy & Conservation |  | Residential Products |  | Industrial and Infrastructure Products |  | Total
Balance at December 31, 2017 | $ | 68,719 |  |  | $ | 198,075 |  |  | $ | 54,280 |  |  | $ | 321,074 |
Acquired goodwill | 3,051 |  |  | — |  |  | — |  |  | 3,051 |
Adjustments to prior year acquisitions | — |  |  | — |  |  | (38 | ) |  | (38 | )
Foreign currency translation | 57 |  |  | — |  |  | (473 | ) |  | (416 | )
Balance at December 31, 2018 | $ | 71,827 |  |  | $ | 198,075 |  |  | $ | 53,769 |  |  | $ | 323,671 |
Acquired goodwill | 5,857 |  |  | — |  |  | — |  |  | 5,857 |
Adjustments to prior year acquisitions | (172 | ) |  | — |  |  | — |  |  | (172 | )
Foreign currency translation | 90 |  |  | — |  |  | 259 |  |  | 349 |
Balance at December 31, 2019 | $ | 77,602 |  |  | $ | 198,075 |  |  | $ | 54,028 |  |  | $ | 329,705 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consist of the following (in thousands):
| December 31, 2019 |  | December 31, 2018 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  | Estimated Useful Life
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 45,770 |  |  | $ | — |  |  | $ | 43,870 |  |  | $ | — |  |  | Indefinite
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 6,139 |  |  | 4,105 |  |  | 6,094 |  |  | 3,518 |  |  | 3 to 15 Years
Unpatented technology | 29,544 |  |  | 15,807 |  |  | 28,644 |  |  | 13,881 |  |  | 5 to 20 Years
Customer relationships | 71,195 |  |  | 40,294 |  |  | 70,419 |  |  | 35,678 |  |  | 5 to 17 Years
Non-compete agreements | 1,649 |  |  | 1,499 |  |  | 1,649 |  |  | 1,224 |  |  | 4 to 10 Years
| 108,527 |  |  | 61,705 |  |  | 106,806 |  |  | 54,301 |  |  |
Total acquired intangible assets | $ | 154,297 |  |  | $ | 61,705 |  |  | $ | 150,676 |  |  | $ | 54,301 |  |  |
Schedule of Acquired Intangible Asset Amortization Expense | The following table summarizes the impairment charges for the years ended December 31 (in thousands):
| 2019 |  | 2018 |  | 2017
| Indefinite-lived intangibles |  | Definite-lived intangibles |  | Indefinite-lived intangibles (1) |  | Definite-lived intangibles (2) |  | Indefinite-lived intangibles (3) |  | Definite-lived intangibles
Renewable Energy and Conservation | $ | — |  |  | $ | — |  |  | $ | 1,037 |  |  | $ | 315 |  |  | $ | 247 |  |  | $ | — |
Residential Products | — |  |  | — |  |  | 200 |  |  | — |  |  | — |  |  | — |
Industrial and Infrastructure Products | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Impairment charges | $ | — |  |  | $ | — |  |  | $ | 1,237 |  |  | $ | 315 |  |  | $ | 247 |  |  | $ | — |
(1) Residential Products impairment charges due to annual testing. Renewable Energy and Conservation impairment charges due to the annual testing in its international solar racking business and restructuring in its domestic greenhouse business. (2) Renewable Energy and Conservation impairment charges due to the restructuring in its domestic greenhouse business. (3) Renewable Energy and Conservation impairment charges due to the discontinuation of its domestic greenhouse business in China.
Schedule of Intangible Assets Amortization Expense | The following table summarizes amortization expense for the years ended December 31 (in thousands):
| 2019 |  | 2018 |  | 2017
Amortization expense | $ | 7,271 |  |  | $ | 8,222 |  |  | $ | 8,761 |
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):
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024
Amortization expense | $ | 7,133 |  |  | $ | 6,938 |  |  | $ | 6,460 |  |  | $ | 5,922 |  |  | $ | 5,666 |

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