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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Other Than Goodwill
Intangible assets, net, other than goodwill, at March 31, 2019 and December 31, 2018 are summarized as follows:

2019
 
2018
 
 
(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
$
102,975

 
$
(69,717
)
 
$
33,258

 
$
103,332

 
$
(67,129
)
 
$
36,203

 
5
Acquired technology
53,304

 
(48,947
)
 
4,357

 
52,691

 
(47,546
)
 
5,145

 
2
Trade names
25,101

 
(18,316
)
 
6,785

 
25,096

 
(17,669
)
 
7,427

 
5
Patent costs
11,263

 
(8,705
)
 
2,558

 
11,032

 
(8,382
)
 
2,650

 
14
Trade secrets
19,295

 
(14,048
)
 
5,247

 
19,374

 
(13,574
)
 
5,800

 
3
Acquired patents
16,197

 
(13,552
)
 
2,645

 
16,212

 
(13,160
)
 
3,052

 
7
Other
26,486

 
(18,836
)
 
7,650

 
26,551

 
(18,553
)
 
7,998

 
1
Total intangible assets
$
254,621

 
$
(192,121
)
 
$
62,500

 
$
254,288

 
$
(186,013
)
 
$
68,275

 
5

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