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Goodwill and Related Intangible Assets
 6 Months Ended
Jun. 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 six months ended June 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 goodwill49,001  —  —  49,001  
Adjustments to prior year acquisitions579  —  —  579  
Foreign currency translation(281) —  (264) (545) 
Balance at June 30, 2020$126,901  $198,075  $53,764  $378,740  

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):
 June 30, 2020December 31, 2019
 Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Indefinite-lived intangible assets:
Trademarks$51,295  $—  $45,770  $—  
Finite-lived intangible assets:
Trademarks6,753  4,328  6,139  4,105  
Unpatented technology35,383  17,031  29,544  15,807  
Customer relationships80,976  42,876  71,195  40,294  
Non-compete agreements1,949  1,640  1,649  1,499  
Backlog300  300  —  —  
125,361  66,175  108,527  61,705  
Total acquired intangible assets$176,656  $66,175  $154,297  $61,705  

The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands):
Three Months Ended 
 
June 30,		Six Months Ended 
 
June 30,
2020201920202019
Amortization expense$2,412  $1,797  $4,490  $3,594  
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$3,860  $7,633  $7,154  $6,617  $6,363  $6,203