Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

At December 31, 2021 and 2020, intangible assets consisted of the following, respectively (in thousands):


	December 31, 2021
	Gross carrying amount		Accumulated amortization		Net intangibles		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
Intangible Assets Total	$	407,443	$	(190,038)	$	217,405


	December 31, 2020
	Gross carrying amount		Accumulated amortization		Net intangibles		Amortization period (in years)
Customer relationships	$	272,470	$	(121,294)	$	151,176	10 - 15
Patents and technology	89,626		(24,440)		65,186		5 - 19
Non-compete agreements	190		(137)		53		2 - 6
Trade names	42,984		(22,941)		20,043		7 - 19
Trademark	5,089		(1,103)		3,986		15
Intangible Assets Total	$	410,359	$	(169,915)	$	240,444

Intangible assets with definite lives are tested for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. For the year ended December 31, 2021, we did not recognize any intangible asset impairment charges. For the year ended December 31, 2020, we recognized intangible asset impairment charges totaling $5.3 million, which are included in “Impairments of intangible assets, property and equipment” in the consolidated statements of comprehensive loss. See Note 8 Impairments of Long-Lived Assets for further information related to these charges.

Amortization expense was $25.1 million and $26.5 million for the years ended December 31, 2021 and 2020, respectively. The estimated future amortization expense for the next five years is as follows (in thousands):


Year ending December 31,	Amount
2022	$	25,161
2023	24,200
2024	22,881
2025	21,694
2026	20,837