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Goodwill and Related Intangible Assets
 6 Months Ended
Jun. 30, 2021
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, 2021 are as follows (in thousands):
RenewablesResidentialAgtechInfrastructureTotal
Balance at December 31, 2020$192,527 $205,452 $84,622 $31,678 $514,279 
Adjustments to prior year acquisitions(4,593)— — — (4,593)
Foreign currency translation(990)— 161 — (829)
Balance at June 30, 2021$186,944 $205,452 $84,783 $31,678 $508,857 

The Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. 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, 2021December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Indefinite-lived intangible assets:
Trademarks$61,100 $— $56,570 $— 
Finite-lived intangible assets:
Trademarks5,550 3,747 5,818 3,385 
Unpatented technology38,386 19,194 38,752 17,765 
Customer relationships109,329 35,658 98,500 31,580 
Non-compete agreements2,691 1,859 4,885 1,747 
Backlog7,216 4,080 7,228 911 
163,172 64,538 155,183 55,388 
Total acquired intangible assets$224,272 $64,538 $211,753 $55,388 
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,
2021202020212020
Amortization expense$4,736 $2,018 $9,479 $4,002 
Amortization expense related to acquired intangible assets for the remainder of fiscal 2021 and the next five years thereafter is estimated as follows (in thousands):
202120222023202420252026
Amortization expense$9,414 $12,167 $11,236 $11,055 $10,820 $9,186