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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Intangible Assets [Abstract] |
Intangible Assets Other Than Goodwill |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 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 | $ | 105,505 |  | $ | (57,796) |  | $ | 47,709 |  | $ | 99,067 |  | $ | (46,252) |  | $ | 52,815 |  | 1-14 |  | 6
﻿Acquired technology |  | 54,716 |  |  | (39,644) |  |  | 15,072 |  |  | 52,881 |  |  | (27,543) |  |  | 25,338 |  | 1-16 |  | 2
﻿Trade names |  | 25,813 |  |  | (15,552) |  |  | 10,261 |  |  | 28,110 |  |  | (16,015) |  |  | 12,095 |  | 1-8 |  | 6
﻿Patent costs |  | 17,909 |  |  | (7,338) |  |  | 10,571 |  |  | 16,263 |  |  | (5,873) |  |  | 10,390 |  | 1-20 |  | 15
﻿Trade secrets |  | 19,431 |  |  | (11,530) |  |  | 7,901 |  |  | 19,134 |  |  | (9,383) |  |  | 9,751 |  | 7 |  | 4
﻿Acquired patents |  | 16,661 |  |  | (11,969) |  |  | 4,692 |  |  | 16,965 |  |  | (10,674) |  |  | 6,291 |  | 1-6 |  | 8
﻿Other |  | 20,012 |  |  | (17,435) |  |  | 2,577 |  |  | 23,431 |  |  | (18,610) |  |  | 4,821 |  | 2-4 |  | 2
﻿Total intangible assets | $ | 260,047 |  | $ | (161,264) |  | $ | 98,783 |  | $ | 255,851 |  | $ | (134,350) |  | $ | 121,501 |  | 1-20 |  | 6
﻿

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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