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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Other Than Goodwill
Intangible assets, net, other than goodwill, at September 30, 2018 and December 31, 2017 are summarized as follows:

2018
 
2017
 
 
(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
$
103,833

 
$
(64,853
)
 
$
38,980

 
$
105,505

 
$
(57,796
)
 
$
47,709

 
6
Acquired technology
49,032

 
(42,677
)
 
6,355

 
54,716

 
(39,644
)
 
15,072

 
2
Trade names
25,200

 
(17,111
)
 
8,089

 
25,813

 
(15,552
)
 
10,261

 
6
Patent costs
18,061

 
(8,086
)
 
9,975

 
17,909

 
(7,338
)
 
10,571

 
15
Trade secrets
19,393

 
(13,066
)
 
6,327

 
19,431

 
(11,530
)
 
7,901

 
4
Acquired patents
16,220

 
(12,761
)
 
3,459

 
16,661

 
(11,969
)
 
4,692

 
8
Other
19,624

 
(18,350
)
 
1,274

 
20,012

 
(17,435
)
 
2,577

 
2
Total intangible assets
$
251,363

 
$
(176,904
)
 
$
74,459

 
$
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.