Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill

The following table represents changes in the carrying amount of goodwill:

	(In thousands)
Balance as of December 31, 2017	$	337,751
Additions	—
Foreign currency exchange rate fluctuations	(1,864)
Balance as of December 31, 2018	335,887
Additions	—
Foreign currency exchange rate fluctuations	652
Balance as of December 31, 2019	$	336,539

Intangible Assets, Net

The carrying amounts and useful lives of intangible assets as of December 31, 2019 and 2018 were as follows:

	December 31, 2019
	Gross carrying amount (1)		Accumulated amortization		Foreign currency exchange rate fluctuations		Net carrying amount		Useful life (years)
	(In thousands, except for years)
Customer relationships	$	135,234	$	(54,860)	$	(1,058)	$	79,316	10 - 30
Acquired technology	77,142		(36,194)		5		40,953		3 - 20
Backlog	1,150		(791)		—		359		4
Trade names	7,650		(5,037)		11		2,624		6 - 12
Patents	3,217		(1,603)		1		1,615		2 - 20
Total intangibles assets, net	$	224,393	$	(98,485)	$	(1,041)	$	124,867

	December 31, 2018
	Gross carrying amount (1)		Accumulated amortization		Foreign currency exchange rate fluctuations		Net carrying amount		Useful life (years)
	(In thousands, except for years)
Customer relationships	$	135,234	$	(45,029)	$	(1,185)	$	89,020	10 - 30
Acquired technology	78,122		(29,206)		42		48,958		3 - 20
Backlog	21,350		(20,703)		—		647		1 - 4
Trade names	7,650		(4,361)		17		3,306		6 - 12
Patents	3,239		(1,488)		4		1,755		2 - 20
Non-compete agreements	1,900		(1,900)		—		—		3
Total intangibles assets, net	$	247,495	$	(102,687)	$	(1,122)	$	143,686

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⁽¹⁾  The differences in gross carrying amounts between periods are primarily due to the write-off of certain fully amortized intangible assets.

Amortization expense of intangible assets was $18.9 million, $23.8 million, and $25.6 million for the years ended December 31, 2019, 2018, and 2017, respectively.

The estimated future amortization expenses for amortizable intangible assets were as follows:

	December 31, 2019
	(In thousands)
2020	$	17,502
2021	16,180
2022	14,832
2023	13,724
2024	7,972
Thereafter	54,657
Total	$	124,867