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Business Combinations - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2015 | Apr. 21, 2015
Aesynt |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 123,700 |  |  |
Aesynt | Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 58,200 |  |  |
Aesynt | Customer relationships | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted average useful life (in years) | 14 years |  |  |
Aesynt | Customer relationships | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted average useful life (in years) | 16 years |  |  |
Aesynt | Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 38,800 |  |  |
Weighted average useful life (in years) | 8 years |  |  |
Aesynt | Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 20,200 |  |  |
Aesynt | Backlog | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted average useful life (in years) | 1 year |  |  |
Aesynt | Backlog | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted average useful life (in years) | 3 years |  |  |
Aesynt | In-process research and development |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 3,900 |  |  |
Aesynt | Non-compete |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 1,800 |  |  |
Weighted average useful life (in years) | 3 years |  |  |
Aesynt | Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 800 |  |  |
Weighted average useful life (in years) | 1 year |  |  |
Ateb |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 12,500 |  |  |
Ateb | Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 8,900 |  |  |
Weighted average useful life (in years) | 12 years |  |  |
Ateb | Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 3,400 |  |  |
Weighted average useful life (in years) | 5 years |  |  |
Ateb | Non-compete |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 100 |  |  |
Weighted average useful life (in years) | 1 year |  |  |
Ateb | Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets | $ 100 |  |  |
Weighted average useful life (in years) | 1 year |  |  |
Mach4 |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 7,710 |  | $ 7,710
Mach4 | Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 3,570 |  |
Weighted average useful life (in years) |  | 10 years |  |
Mach4 | Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 3,290 |  |
Weighted average useful life (in years) |  | 8 years |  |
Mach4 | Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 850 |  |
Weighted average useful life (in years) |  | 6 years |  |
Avantec |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 6,341 | $ 6,341 |
Avantec | Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 5,834 |  |
Weighted average useful life (in years) |  | 12 years |  |
Avantec | Developed technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 0 |  |
Avantec | Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 415 |  |
Weighted average useful life (in years) |  | 2 years |  |
Avantec | Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Total purchased intangible assets |  | $ 92 |  |
Weighted average useful life (in years) |  | 2 years |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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