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Business Combinations - Identifiable Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
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

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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