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INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2020

NOTE 9—INTANGIBLE ASSETS

The carrying amount of intangible assets, net of accumulated amortization and impairment charges, as of December 31, 2020 and 2019 consisted of the following:


			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


			2019
			Gross
	Estimated		Carrying				Accumulated		Currency		Net Book
	Useful Lives		Amount		Acquisitions		Amortization		impact		Value
Amortizable intangibles:
Customer relationships	2 to 15	years	$	73,723	$	—	$	(63,761)	$	(116)	$	9,846
Noncompete agreements	4 to 7	years		5,952		—		(5,862)		1		91
Software	3 to 4	years		1,500		—		(1,500)		—		—
Backlog	1 to 2	years		5,002		—		(4,981)		(21)		—
Databases	4 to 15	years		13,218		—		(6,364)		(186)		6,668
Trademark and trade names	5	years		1,250		—		(1,250)		—		—
Intangibles			$	100,645	$	—	$	(83,718)	$	(322)	$	16,605

Amortization expense was $3.5 million and $4.0 million for the years ended December 31, 2020 and 2019, respectively. The estimated future amortization expense subsequent to December 31, 2020, is as follows:


2021	$	2,642
2022		2,110
2023		1,814
2024		1,495
2025		1,326
Thereafter		5,677
	$	15,064