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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
Goodwill and intangible assets consisted of the following at December 31:
20202019
(in thousands)Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Gross
Carrying
Amount
Accumulated
Amortization
Net
Carrying
Amount
Goodwill
T&D$40,224 $— $40,224 $40,224 $— $40,224 
C&I25,841 — 25,841 25,836 — 25,836 
Total goodwill$66,065 $— $66,065 $66,060 $— $66,060 
Amortizable Intangible Assets
Backlog$5,289 $5,289 $— $5,289 $4,039 $1,250 
Customer relationships31,381 8,914 22,467 31,381 6,623 24,758 
Trade names696 264 432 695 218 477 
Indefinite-lived Intangible Assets
Trade names28,466 — 28,466 28,455 — 28,455 
Total intangible assets$65,832 $14,467 $51,365 $65,820 $10,880 $54,940 
Schedule of Estimated Future Intangible Asset Amortization Expense
As of December 31, 2020, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
(in thousands)Future
Amortization
Expense
2021$2,312 
20222,312 
20232,312 
20242,312 
20252,312 
Thereafter11,339 
Total$22,899