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Intangible Assets

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

At December 31, 2022 and 2021, intangible assets consisted of the following (in thousands):


	December 31, 2022
	Cost		Accumulated amortization		Net		Amortization period (in years)
Customer relationships	$	266,537	$	(147,496)	$	119,041	10 - 35
Patents and technology	88,863		(35,298)		53,565		5 - 19
Non-compete agreements	188		(188)		—		5
Trade names	42,638		(27,071)		15,567		7 - 19
Trademark	5,089		(1,781)		3,308		15
Total intangible assets	$	403,315	$	(211,834)	$	191,481


	December 31, 2021
	Cost		Accumulated amortization		Net		Amortization period (in years)
Customer relationships	$	269,589	$	(133,451)	$	136,138	10 - 15
Patents and technology	89,449		(29,785)		59,664		5 - 19
Non-compete agreements	191		(173)		18		2 - 6
Trade names	43,125		(25,187)		17,938		7 - 19
Trademark	5,089		(1,442)		3,647		15
Total intangible assets	$	407,443	$	(190,038)	$	217,405

Intangible assets with definite lives are tested for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable.

Amortization expense was $24.5 million and $25.1 million for the years ended December 31, 2022 and 2021, respectively. The estimated future amortization expense for the next five years is as follows (in thousands):


Year ending December 31,	Amount
2023	$	24,302
2024	22,545
2025	21,405
2026	20,581
2027	19,135