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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets Other Than Goodwill | Intangible assets other than goodwill at December 31, 2018 and December 31, 2017 are summarized as follows:
﻿ |  | 2018 |  | 2017 |  |  |  |
(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 |  | $ | 103,332 |  |  | $ | (67,129 | ) |  | $ | 36,203 |  |  | $ | 105,505 |  |  | $ | (57,796 | ) |  | $ | 47,709 |  |  | 1-12 |  | 5
Acquired technology |  | 52,691 |  |  | (47,546 | ) |  | 5,145 |  |  | 54,716 |  |  | (39,644 | ) |  | 15,072 |  |  | 1-2 |  | 2
Trade names |  | 25,096 |  |  | (17,669 | ) |  | 7,427 |  |  | 25,813 |  |  | (15,552 | ) |  | 10,261 |  |  | 3-6 |  | 5
Patent costs |  | 11,032 |  |  | (8,382 | ) |  | 2,650 |  |  | 17,909 |  |  | (7,338 | ) |  | 10,571 |  |  | 1-19 |  | 14
Trade secrets |  | 19,374 |  |  | (13,574 | ) |  | 5,800 |  |  | 19,431 |  |  | (11,530 | ) |  | 7,901 |  |  | 2-4 |  | 3
Acquired patents |  | 16,212 |  |  | (13,160 | ) |  | 3,052 |  |  | 16,661 |  |  | (11,969 | ) |  | 4,692 |  |  | 6-8 |  | 7
Other |  | 26,551 |  |  | (18,553 | ) |  | 7,998 |  |  | 20,012 |  |  | (17,435 | ) |  | 2,577 |  |  | 1-2 |  | 1
Total intangible assets |  | $ | 254,288 |  |  | $ | (186,013 | ) |  | $ | 68,275 |  |  | $ | 260,047 |  |  | $ | (161,264 | ) |  | $ | 98,783 |  |  | 1-19 |  | 5

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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