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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Other Than Goodwill | Intangible assets, net, other than goodwill, at December 31, 2019 and 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 | $ | 103,661 |  |  | $ | (77,021) |  |  | $ | 26,640 |  |  | $ | 103,332 |  |  | $ | (67,129) |  |  | $ | 36,203 |  |  | 4
Acquired technology | 54,378 |  |  | (51,875) |  |  | 2,503 |  |  | 52,691 |  |  | (47,546) |  |  | 5,145 |  |  | 1
Trade names | 23,907 |  |  | (19,133) |  |  | 4,774 |  |  | 25,096 |  |  | (17,669) |  |  | 7,427 |  |  | 4
Patent costs | 11,760 |  |  | (9,535) |  |  | 2,225 |  |  | 11,032 |  |  | (8,382) |  |  | 2,650 |  |  | 15
Trade secrets | 19,494 |  |  | (15,714) |  |  | 3,780 |  |  | 19,374 |  |  | (13,574) |  |  | 5,800 |  |  | 2
Acquired patents | 16,215 |  |  | (14,706) |  |  | 1,509 |  |  | 16,212 |  |  | (13,160) |  |  | 3,052 |  |  | 7
Other | 26,256 |  |  | (19,349) |  |  | 6,907 |  |  | 26,551 |  |  | (18,553) |  |  | 7,998 |  |  | 1
Total intangible assets | $ | 255,671 |  |  | $ | (207,333) |  |  | $ | 48,338 |  |  | $ | 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.

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