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INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2021

NOTE 9—INTANGIBLE ASSETS

The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2021 and 2020 consisted of the following:


			2021
			Gross
	Estimated		Carrying				Accumulated		Currency		Net Book
	Useful Lives		Amount		Acquisitions		Amortization		impact		Value
Amortizable intangibles:
Customer relationships	2 to 15	years	$	75,283	$	—	$	(68,677)	$	(111)	$	6,495
Noncompete agreements	4 to 7	years		5,962		—		(5,960)		—		2
Software	3 to 4	years		1,660		—		(1,534)		—		126
Backlog	1 to 2	years		5,002		—		(4,981)		(21)		—
Databases	4 to 15	years		13,218		—		(7,371)		(180)		5,667
Trademark and trade names	5	years		1,490		—		(1,370)		—		120
Intangibles			$	102,615	$	—	$	(89,893)	$	(312)	$	12,410


			2020
			Gross
	Estimated		Carrying				Accumulated		Currency		Net Book
	Useful Lives		Amount		Acquisitions		Amortization		impact		Value
Amortizable intangibles:
Customer relationships	2 to 15	years	$	73,723	$	1,560	$	(66,705)	$	(108)	$	8,470
Noncompete agreements	4 to 7	years		5,952		10		(5,911)		—		51
Software	3 to 4	years		1,500		160		(1,511)		—		149
Backlog	1 to 2	years		5,002		—		(4,981)		(21)		—
Databases	4 to 15	years		13,218		—		(6,852)		(172)		6,194
Trademark and trade names	5	years		1,250		240		(1,290)		—		200
Intangibles			$	100,645	$	1,970	$	(87,250)	$	(301)	$	15,064

Amortization expense was $2.6 million and $3.5 million for the years ended December 31, 2021 and 2020, respectively. The estimated future amortization expense subsequent to December 31, 2021, is as follows:


2022	$	2,110
2023		1,814
2024		1,495
2025		1,326
2026		1,201
Thereafter		4,464
	$	12,410