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Goodwill and Related Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule Of Changes In Carrying Amount Of 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 
Schedule Of 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 
Schedule of Acquired Intangible Asset Amortization Expense
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 
Schedule Of Amortization Expense
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