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Intangible Assets
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets, net, other than goodwill, at March 31, 2018 and December 31, 2017 are summarized as follows:

2018
 
2017
 
 
(in thousands)
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
 
Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives:
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
$
107,094

 
$
(61,287
)
 
$
45,807

 
$
105,505

 
$
(57,796
)
 
$
47,709

 
6
Acquired technology
50,370

 
(38,108
)
 
12,262

 
54,716

 
(39,644
)
 
15,072

 
2
Trade names
25,972

 
(16,381
)
 
9,591

 
25,813

 
(15,552
)
 
10,261

 
6
Patent costs
18,230

 
(8,069
)
 
10,161

 
17,909

 
(7,338
)
 
10,571

 
15
Trade secrets
19,601

 
(12,117
)
 
7,484

 
19,431

 
(11,530
)
 
7,901

 
4
Acquired patents
16,690

 
(12,390
)
 
4,300

 
16,661

 
(11,969
)
 
4,692

 
8
Other
20,270

 
(18,075
)
 
2,195

 
20,012

 
(17,435
)
 
2,577

 
2
Total intangible assets
$
258,227

 
$
(166,427
)
 
$
91,800

 
$
260,047

 
$
(161,264
)
 
$
98,783

 
6


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

Amortization expense related to intangible assets was $8,067 and $8,832 for the quarters ended March 31, 2018 and 2017, respectively.