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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets Other Than Goodwill
Intangible assets other than goodwill at December 31, 2018 and December 31, 2017 are summarized as follows:


 
2018
 
2017
 
 
 
 
(in thousands)
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
 
Useful Life (in years)
 
Weighted Average Useful Life Remaining (in years)
Intangible assets with finite lives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
 
$
103,332

 
$
(67,129
)
 
$
36,203

 
$
105,505

 
$
(57,796
)
 
$
47,709

 
1-12
 
5
Acquired technology
 
52,691

 
(47,546
)
 
5,145

 
54,716

 
(39,644
)
 
15,072

 
1-2
 
2
Trade names
 
25,096

 
(17,669
)
 
7,427

 
25,813

 
(15,552
)
 
10,261

 
3-6
 
5
Patent costs
 
11,032

 
(8,382
)
 
2,650

 
17,909

 
(7,338
)
 
10,571

 
1-19
 
14
Trade secrets
 
19,374

 
(13,574
)
 
5,800

 
19,431

 
(11,530
)
 
7,901

 
2-4
 
3
Acquired patents
 
16,212

 
(13,160
)
 
3,052

 
16,661

 
(11,969
)
 
4,692

 
6-8
 
7
Other
 
26,551

 
(18,553
)
 
7,998

 
20,012

 
(17,435
)
 
2,577

 
1-2
 
1
Total intangible assets
 
$
254,288

 
$
(186,013
)
 
$
68,275

 
$
260,047

 
$
(161,264
)
 
$
98,783

 
1-19
 
5