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Intangible Assets (Tables) | 3 Months Ended
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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.

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