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Intangible Assets | 9 Months Ended
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Sep. 30, 2017
Intangible Assets [Abstract] |
Intangible Assets | (5) Intangible Assets ﻿ Intangible assets, net, other than goodwill, as of September 30, 2017 and December 31, 2016 were as follows:
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2017 |  | 2016 |  |  |  |
﻿(in thousands) | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net |  | Useful Life (in years) |  | Weighted Average Useful Life Remaining (in years)
﻿Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Customer relationships | $ | 106,674 |  | $ | (56,538) |  | $ | 50,136 |  | $ | 99,067 |  | $ | (46,252) |  | $ | 52,815 |  | 1-14 |  | 6
﻿Acquired technology |  | 55,148 |  |  | (37,324) |  |  | 17,824 |  |  | 52,881 |  |  | (27,543) |  |  | 25,338 |  | 1-16 |  | 4
﻿Trade names |  | 27,764 |  |  | (16,322) |  |  | 11,442 |  |  | 28,110 |  |  | (16,015) |  |  | 12,095 |  | 1-8 |  | 5
﻿Patent costs |  | 17,135 |  |  | (6,794) |  |  | 10,341 |  |  | 16,263 |  |  | (5,873) |  |  | 10,390 |  | 1-20 |  | 9
﻿Trade secrets |  | 19,443 |  |  | (11,016) |  |  | 8,427 |  |  | 19,134 |  |  | (9,383) |  |  | 9,751 |  | 7 |  | 4
﻿Acquired patents |  | 16,655 |  |  | (11,556) |  |  | 5,099 |  |  | 16,965 |  |  | (10,674) |  |  | 6,291 |  | 1-6 |  | 4
﻿Other |  | 25,683 |  |  | (22,320) |  |  | 3,363 |  |  | 23,431 |  |  | (18,610) |  |  | 4,821 |  | 2-4 |  | 2
﻿Total intangible assets | $ | 268,502 |  | $ | (161,870) |  | $ | 106,632 |  | $ | 255,851 |  | $ | (134,350) |  | $ | 121,501 |  | 1-20 |  | 4
﻿ Amortization expense related to intangible assets was $8,845 and $26,661 for the quarter and nine months ended September 30, 2017, respectively, compared to $8,857 and $26,536 for the quarter and nine months ended September 30, 2016, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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