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Goodwill and Related Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
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):
| Renewables |  | Residential |  | Agtech |  | Infrastructure |  | Total
Balance at December 31, 2019 | $ | 44,816 |  |  | $ | 198,075 |  |  | $ | 32,786 |  |  | $ | 31,678 |  |  | $ | 307,355 |
Acquired goodwill | 147,004 |  |  | 7,377 |  |  | 50,862 |  |  | — |  |  | 205,243 |
Adjustments to prior year acquisitions | — |  |  | — |  |  | 578 |  |  | — |  |  | 578 |
Foreign currency translation | 707 |  |  | — |  |  | 396 |  |  | — |  |  | 1,103 |
Balance at December 31, 2020 | $ | 192,527 |  |  | $ | 205,452 |  |  | $ | 84,622 |  |  | 31,678 |  |  | $ | 514,279 |
Adjustments to prior year acquisitions | (2,433) |  |  | — |  |  | 323 |  |  | — |  |  | (2,110) |
Foreign currency translation | (1,414) |  |  | — |  |  | 187 |  |  | — |  |  | (1,227) |
Balance at December 31, 2021 | $ | 188,680 |  |  | $ | 205,452 |  |  | $ | 85,132 |  |  | 31,678 |  |  | $ | 510,942 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consist of the following (in thousands):
| December 31, 2021 |  | December 31, 2020 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 52,700 |  |  | $ | — |  |  | $ | 56,570 |  |  | $ | — |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 5,521 |  |  | 4,011 |  |  | 5,818 |  |  | 3,385 |  |  |
Unpatented technology | 38,474 |  |  | 20,656 |  |  | 38,752 |  |  | 17,765 |  |  |
Customer relationships | 108,591 |  |  | 39,832 |  |  | 98,500 |  |  | 31,580 |  |  |
Non-compete agreements | 2,686 |  |  | 1,969 |  |  | 4,885 |  |  | 1,747 |  |  |
Backlog | 7,200 |  |  | 7,200 |  |  | 7,228 |  |  | 911 |  |  |
| 162,472 |  |  | 73,668 |  |  | 155,183 |  |  | 55,388 |  |  |
Total acquired intangible assets | $ | 215,172 |  |  | $ | 73,668 |  |  | $ | 211,753 |  |  | $ | 55,388 |  |  |
Schedule of Intangible Assets Amortization Expense | The following table summarizes amortization expense for the years ended December 31 (in thousands):
| 2021 |  | 2020 |  | 2019
Amortization expense | $ | 18,856 |  |  | $ | 9,663 |  |  | $ | 6,891 |
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):
|  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
| Amortization expense | $ | 12,124 |  |  | $ | 11,195 |  |  | $ | 11,014 |  |  | $ | 10,780 |  |  | $ | 9,161 |

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