Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

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



	December 31, 2018		Additions		Foreign currency exchange rate fluctuations		March 31, 2019
	(In thousands)
Goodwill	$	335,887	$	—	$	232	$	336,119

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



	March 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	$	(47,557	)	$	(1,127	)	$	86,550	1 - 30
Acquired technology	77,142		(30,239		)	8			46,911		3 - 20
Backlog	1,150		(575		)	—			575		1 - 4
Trade names	7,650		(4,530		)	11			3,131		1 - 12
Patents	3,239		(1,515		)	2			1,726		2 - 20
Total intangibles assets, net	$	224,415	$	(84,416	)	$	(1,106	)	$	138,893



	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	1 - 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		1 - 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 due to the write-off of fully amortized intangible assets.

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