Goodwill and Other Intangible Assets Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 10, 2015	Apr. 03, 2016	Dec. 31, 2015	Mar. 29, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 258,240	$ 145,607	$ 166,923	$ 170,773
DCG Systems [Member] [Member]
Business Acquisition [Line Items]
Current assets	$ 64,335
Non-current assets	9,930
Deferred tax assets	207
Current liabilities	(23,859)
Non-current liabilities	(7,889)
Net tangible assets acquired	42,724
Intangible assets acquired	31,500
Goodwill		$ 108,002
Total	182,226
In-Process Research and Development | DCG Systems [Member] [Member]
Business Acquisition [Line Items]
Intangible assets acquired	13,100
Customer Relationships | DCG Systems [Member] [Member]
Business Acquisition [Line Items]
Intangible assets acquired	6,900
Backlog | DCG Systems [Member] [Member]
Business Acquisition [Line Items]
Intangible assets acquired	1,000
Developed Technology | DCG Systems [Member] [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 10,500