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Intangible Assets | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | (5) Intangible Assets Intangible assets, net, other than goodwill, at September 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 | $ | 102,023 |  |  | $ | (74,349) |  |  | $ | 27,674 |  |  | $ | 103,332 |  |  | $ | (67,129) |  |  | $ | 36,203 |  |  | 5
Acquired technology | 54,067 |  |  | (51,241) |  |  | 2,826 |  |  | 52,691 |  |  | (47,546) |  |  | 5,145 |  |  | 2
Trade names | 23,668 |  |  | (18,402) |  |  | 5,266 |  |  | 25,096 |  |  | (17,669) |  |  | 7,427 |  |  | 5
Patent costs | 11,678 |  |  | (9,079) |  |  | 2,599 |  |  | 11,032 |  |  | (8,382) |  |  | 2,650 |  |  | 14
Trade secrets | 19,296 |  |  | (15,076) |  |  | 4,220 |  |  | 19,374 |  |  | (13,574) |  |  | 5,800 |  |  | 3
Acquired patents | 16,184 |  |  | (14,340) |  |  | 1,844 |  |  | 16,212 |  |  | (13,160) |  |  | 3,052 |  |  | 7
Other | 25,712 |  |  | (18,888) |  |  | 6,824 |  |  | 26,551 |  |  | (18,553) |  |  | 7,998 |  |  | 1
Total intangible assets | $ | 252,628 |  |  | $ | (201,375) |  |  | $ | 51,253 |  |  | $ | 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 $5,287 and $16,525 for the quarter and nine months ended September 30, 2019, respectively, compared to $7,811 and $23,714 for the quarter and nine months ended September 30, 2018, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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