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Goodwill and Related Intangible Assets | 9 Months Ended
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Sep. 30, 2018
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 nine months ended September 30, 2018 are as follows (in thousands):
| Residential Products |  | Industrial and Infrastructure Products |  | Renewable Energy & Conservation |  | Total
Balance at December 31, 2017 | $ | 198,075 |  |  | $ | 54,280 |  |  | $ | 68,719 |  |  | $ | 321,074 |
Acquired goodwill | — |  |  | — |  |  | 2,838 |  |  | 2,838 |
Adjustments to prior year acquisitions | — |  |  | (38 | ) |  | — |  |  | (38 | )
Foreign currency translation | — |  |  | (165 | ) |  | (388 | ) |  | (553 | )
Balance at September 30, 2018 | $ | 198,075 |  |  | $ | 54,077 |  |  | $ | 71,169 |  |  | $ | 323,321 |
Acquired Intangible Assets Acquired intangible assets consist of the following (in thousands):
| September 30, 2018 |  | December 31, 2017 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  | Estimated Life
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 45,096 |  |  | $ | — |  |  | $ | 45,107 |  |  | $ | — |  |  | Indefinite
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 6,148 |  |  | 3,397 |  |  | 5,876 |  |  | 3,062 |  |  | 3 to 15 Years
Unpatented technology | 28,644 |  |  | 13,406 |  |  | 28,107 |  |  | 12,033 |  |  | 5 to 20 Years
Customer relationships | 70,593 |  |  | 34,626 |  |  | 80,707 |  |  | 39,652 |  |  | 5 to 17 Years
Non-compete agreements | 1,649 |  |  | 1,156 |  |  | 1,649 |  |  | 931 |  |  | 4 to 10 Years
| 107,034 |  |  | 52,585 |  |  | 116,339 |  |  | 55,678 |  |  |
Total acquired intangible assets | $ | 152,130 |  |  | $ | 52,585 |  |  | $ | 161,446 |  |  | $ | 55,678 |  |  |
The Company recognized impairment charges related to a finite-lived intangible asset for the three and nine months ended September 30, 2018 of $1.3 million. The charge relates to the discontinuation of lower margin sales in the Residential Products segment. The following table summarizes the acquired intangible asset amortization expense for the three and nine months ended September 30 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization expense | $ | 2,121 |  |  | $ | 2,208 |  |  | $ | 6,408 |  |  | $ | 6,600 |
Amortization expense related to acquired intangible assets for the remainder of fiscal 2018 and the next five years thereafter is estimated as follows (in thousands):
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Amortization expense | $ | 1,960 |  |  | $ | 7,841 |  |  | $ | 7,329 |  |  | $ | 6,726 |  |  | $ | 6,315 |  |  | $ | 5,776 |

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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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