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Goodwill and Related Intangible Assets
 9 Months Ended
Sep. 30, 2020
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, 2020 are as follows (in thousands):
Renewable Energy & ConservationResidential ProductsIndustrial and
Infrastructure
Products		Total
Balance at December 31, 2019$77,602 $198,075 $54,028 $329,705 
Acquired goodwill51,629 — — 51,629 
Adjustments to prior year acquisitions579 — — 579 
Foreign currency translation664 — (150)514 
Balance at September 30, 2020$130,474 $198,075 $53,878 $382,427 

The Company conducts its annual goodwill impairment test as of October 31 each year. All of the Company’s ten reporting units had fair values exceeding their carrying values as of October 31, 2019. In addition to the annual impairment test, the Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. The Company considered the current and future macroeconomic and market conditions, along with its current market capitalization, projected cash flows and internal and external forecasts, and projections relating to the impact of the COVID-19 pandemic on each of its reporting units. The Company determined that a triggering event has not occurred which would require an interim impairment test to be performed.

Acquired Intangible Assets
Acquired intangible assets consist of the following (in thousands):
 September 30, 2020December 31, 2019
 Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Indefinite-lived intangible assets:
Trademarks$52,170 $— $45,770 $— 
Finite-lived intangible assets:
Trademarks7,235 4,557 6,139 4,105 
Unpatented technology35,962 17,970 29,544 15,807 
Customer relationships79,702 44,723 71,195 40,294 
Non-compete agreements2,174 1,689 1,649 1,499 
Backlog899 382 — — 
125,972 69,321 108,527 61,705 
Total acquired intangible assets$178,142 $69,321 $154,297 $61,705 

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,
2020201920202019
Amortization expense$3,041 $1,840 $7,531 $5,434 
Amortization expense related to acquired intangible assets for the remainder of fiscal 2020 and the next five years thereafter is estimated as follows (in thousands):
202020212022202320242025
Amortization expense$2,247 $8,772 $8,294 $7,664 $7,132 $6,961