Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and intangible assets consisted of the following at December 31:


	2021						2020
(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&I	25,841		—		25,841		25,841		—		25,841
Total goodwill	$	66,065	$	—	$	66,065	$	66,065	$	—	$	66,065
Amortizable Intangible Assets
Backlog	$	5,289	$	5,289	$	—	$	5,289	$	5,289	$	—
Customer relationships	31,381		11,179		20,202		31,381		8,914		22,467
Trade names	696		311		385		696		264		432
Indefinite-lived Intangible Assets
Trade names	28,467		—		28,467		28,466		—		28,466
Total intangible assets	$	65,833	$	16,779	$	49,054	$	65,832	$	14,467	$	51,365

Customer relationships and backlog are being amortized on a straight-line method over an estimated useful life ranging up to 12.5 years and the remaining life of the contract, respectively, and have been determined to have no residual value. Amortizable trade names are being amortized on a straight-line basis over an estimated useful life of approximately 15 years. Certain trade names have indefinite lives and, therefore, are not being amortized. Intangible asset amortization expense was $2.3 million, $3.6 million and $3.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. Immaterial foreign currency translation adjustments related to goodwill and intangible assets are netted with the amounts indicated above.

As of December 31, 2021, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:


(in thousands)	Future Amortization Expense
2022	$	2,312
2023	2,312
2024	2,312
2025	2,312
2026	2,312
Thereafter	9,027
Total	$	20,587