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Goodwill and Related Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND RELATED INTANGIBLE ASSETS | GOODWILL AND RELATED INTANGIBLE ASSETS Goodwill The changes in the carrying amount of goodwill for the three months ended March 31, 2019 are as follows (in thousands):
| Residential Products |  | Industrial and Infrastructure Products |  | Renewable Energy & Conservation |  | Total
Balance at December 31, 2018 | $ | 198,075 |  |  | $ | 53,769 |  |  | $ | 71,827 |  |  | $ | 323,671 |
Adjustments to prior year acquisitions | — |  |  | — |  |  | (172 | ) |  | (172 | )
Foreign currency translation | — |  |  | 116 |  |  | (42 | ) |  | 74 |
Balance at March 31, 2019 | $ | 198,075 |  |  | $ | 53,885 |  |  | $ | 71,613 |  |  | $ | 323,573 |
Acquired Intangible Assets Acquired intangible assets consist of the following (in thousands):
| March 31, 2019 |  | December 31, 2018 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  | Estimated Life
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 43,870 |  |  | $ | — |  |  | $ | 43,870 |  |  | $ | — |  |  | Indefinite
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 6,114 |  |  | 3,669 |  |  | 6,094 |  |  | 3,518 |  |  | 3 to 15 Years
Unpatented technology | 28,644 |  |  | 14,352 |  |  | 28,644 |  |  | 13,881 |  |  | 5 to 20 Years
Customer relationships | 70,348 |  |  | 36,791 |  |  | 70,419 |  |  | 35,678 |  |  | 5 to 17 Years
Non-compete agreements | 1,649 |  |  | 1,293 |  |  | 1,649 |  |  | 1,224 |  |  | 4 to 10 Years
| 106,755 |  |  | 56,105 |  |  | 106,806 |  |  | 54,301 |  |  |
Total acquired intangible assets | $ | 150,625 |  |  | $ | 56,105 |  |  | $ | 150,676 |  |  | $ | 54,301 |  |  |
The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands):
| Three Months Ended March 31,
| 2019 |  | 2018
Amortization expense | $ | 1,797 |  |  | $ | 2,139 |
Amortization expense related to acquired intangible assets for the remainder of fiscal 2019 and the next five years thereafter is estimated as follows (in thousands):
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024
Amortization expense | $ | 5,390 |  |  | $ | 6,895 |  |  | $ | 6,700 |  |  | $ | 6,222 |  |  | $ | 5,684 |  |  | $ | 5,428 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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