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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Intangible Assets [Abstract] |
Intangible Assets Other Than Goodwill |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2016 |  | 2015 |  |  |  |
﻿(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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Patent costs | $ | 16,263 |  | $ | (5,873) |  | $ | 10,390 |  | $ | 16,251 |  | $ | (4,895) |  | $ | 11,356 |  | 1-20 |  | 9
﻿Acquired technology |  | 52,881 |  |  | (27,543) |  |  | 25,338 |  |  | 52,809 |  |  | (16,405) |  |  | 36,404 |  | 1-16 |  | 4
﻿Internally developed software |  | 4,730 |  |  | (3,522) |  |  | 1,208 |  |  | 4,730 |  |  | (2,919) |  |  | 1,811 |  | 2 |  | 2
﻿Customer relationships |  | 99,067 |  |  | (46,252) |  |  | 52,815 |  |  | 101,933 |  |  | (36,158) |  |  | 65,775 |  | 1-14 |  | 6
﻿Non-compete agreements |  | 9,423 |  |  | (7,277) |  |  | 2,146 |  |  | 12,163 |  |  | (8,558) |  |  | 3,605 |  | 1-4 |  | 2
﻿Trade names |  | 28,110 |  |  | (16,015) |  |  | 12,095 |  |  | 28,108 |  |  | (12,498) |  |  | 15,610 |  | 1-8 |  | 5
﻿Other |  | 45,377 |  |  | (27,868) |  |  | 17,509 |  |  | 46,435 |  |  | (23,530) |  |  | 22,905 |  | 1-6 |  | 4
﻿Total intangible assets | $ | 255,851 |  | $ | (134,350) |  | $ | 121,501 |  | $ | 262,429 |  | $ | (104,963) |  | $ | 157,466 |  | 1-20 |  | 4
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- Definition Schedule of Finite And Indefinite-Lived Intangible Assets [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | ddd_
Data Type: | nonnum:textBlockItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration