Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

Intangible assets, net, other than goodwill, at March 31, 2020 and December 31, 2019 are summarized as follows:


	2020										2019
(in thousands)	Gross ^(a)		Accumulated Amortization		Net		Gross ^(a)		Accumulated Amortization		Net		Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives:
Customer relationships	$	102,920	$	(78,996)	$	23,924	$	103,661	$	(77,021)	$	26,640	4
Acquired technology	53,665		(51,554)		2,111		54,378		(51,875)		2,503		1
Trade names	23,397		(19,086)		4,311		23,907		(19,133)		4,774		4
Patent costs	11,974		(9,607)		2,367		11,760		(9,535)		2,225		15
Trade secrets	19,530		(16,257)		3,273		19,494		(15,714)		3,780		2
Acquired patents	16,207		(14,954)		1,253		16,215		(14,706)		1,509		7
Other	25,664		(19,115)		6,549		26,256		(19,349)		6,907		1
Total intangible assets	$	253,357	$	(209,569)	$	43,788	$	255,671	$	(207,333)	$	48,338	5

^(a) Change in gross carrying amounts consists primarily of charges for license and patent costs and foreign currency translation.