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