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INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2023

NOTE 9—INTANGIBLE ASSETS

The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2023 and 2022 consisted of the following:


			2023
			Gross
			Carrying				Accumulated		Currency		Net Book
	Estimated Useful Lives		Amount		Acquisitions		Amortization		Impact		Value
Amortizable intangibles:
Customer relationships	2 to 15	years	$	78,183		700	$	(72,220)	$	(120)	$	6,543
Noncompete agreements	4 to 7	years		6,262		100		(6,146)		1		217
Software	3 to 4	years		1,660		—		(1,580)		—		80
Backlog	1 to 2	years		5,002		—		(4,981)		(21)		—
Databases	4 to 15	years		13,218		—		(8,455)		(180)		4,583
Trademark and trade names	3 to 5	years		2,590		600		(1,998)		—		1,192
Intangibles			$	106,915	$	1,400	$	(95,380)	$	(320)	$	12,615


			2022
			Gross
			Carrying				Accumulated		Currency		Net Book
	Estimated Useful Lives		Amount		Acquisitions		Amortization		Impact		Value
Amortizable intangibles:
Customer relationships	2 to 15	years	$	75,283	$	2,900	$	(70,273)	$	(115)	$	7,795
Noncompete agreements	4 to 7	years		5,962		300		(5,987)		—		275
Software	3 to 4	years		1,660		—		(1,557)		—		103
Backlog	1 to 2	years		5,002		—		(4,981)		(21)		—
Databases	4 to 15	years		13,218		—		(7,905)		(183)		5,130
Trademark and trade names	3 to 5	years		1,490		1,100		(1,513)		—		1,077
Intangibles			$	102,615	$	4,300	$	(92,216)	$	(319)	$	14,380

Amortization expense was $3.2 million, $2.3 million and $2.6 million for the years ended December 31, 2023, 2022 and 2021, respectively. The estimated future amortization expense subsequent to December 31, 2023 is as follows:


2024	$	2,927
2025		2,391
2026		1,774
2027		1,444
2028		1,253
Thereafter		2,826
	$	12,615