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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Other Than Goodwill | Intangible assets, net, other than goodwill, at June 30, 2020 and December 31, 2019 are summarized as follows:
﻿ | 2020 |  |  |  |  |  | 2019 |  |  |  |  |  |
(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 | $ | 103,947 |  |  | $ | (82,087) |  |  | $ | 21,860 |  |  | $ | 103,661 |  |  | $ | (77,021) |  |  | $ | 26,640 |  |  | 4
Acquired technology | 54,318 |  |  | (52,541) |  |  | 1,777 |  |  | 54,378 |  |  | (51,875) |  |  | 2,503 |  |  | 1
Trade names | 23,528 |  |  | (19,610) |  |  | 3,918 |  |  | 23,907 |  |  | (19,133) |  |  | 4,774 |  |  | 4
Patent costs | 18,836 |  |  | (9,919) |  |  | 8,917 |  |  | 11,760 |  |  | (9,535) |  |  | 2,225 |  |  | 15
Trade secrets | 19,629 |  |  | (16,847) |  |  | 2,782 |  |  | 19,494 |  |  | (15,714) |  |  | 3,780 |  |  | 2
Acquired patents | 16,226 |  |  | (15,219) |  |  | 1,007 |  |  | 16,215 |  |  | (14,706) |  |  | 1,509 |  |  | 7
Other | 19,348 |  |  | (19,340) |  |  | 8 |  |  | 26,256 |  |  | (19,349) |  |  | 6,907 |  |  | 1
Total intangible assets | $ | 255,832 |  |  | $ | (215,563) |  |  | $ | 40,269 |  |  | $ | 255,671 |  |  | $ | (207,333) |  |  | $ | 48,338 |  |  | 5
(a) Change in gross carrying amounts consists primarily of charges for license and patent costs and foreign currency translation.

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