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Intangible Assets
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
(5) Intangible Assets

Intangible assets, net, other than goodwill, at June 30, 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
$
103,638

 
$
(72,745
)
 
$
30,893

 
$
103,332

 
$
(67,129
)
 
$
36,203

 
5
Acquired technology
53,745

 
(50,279
)
 
3,466

 
52,691

 
(47,546
)
 
5,145

 
2
Trade names
23,937

 
(18,001
)
 
5,936

 
25,096

 
(17,669
)
 
7,427

 
5
Patent costs
11,548

 
(8,914
)
 
2,634

 
11,032

 
(8,382
)
 
2,650

 
14
Trade secrets
19,432

 
(14,639
)
 
4,793

 
19,374

 
(13,574
)
 
5,800

 
3
Acquired patents
16,215

 
(13,958
)
 
2,257

 
16,212

 
(13,160
)
 
3,052

 
7
Other
26,457

 
(19,169
)
 
7,288

 
26,551

 
(18,553
)
 
7,998

 
1
Total intangible assets
$
254,972

 
$
(197,705
)
 
$
57,267

 
$
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.

Amortization expense related to intangible assets was $5,718 and $11,238 for the quarter and six months ended June 30, 2019, respectively, compared to $7,836 and $15,903 for the quarter and six months ended June 30, 2018, respectively.