Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 03, 2015	Dec. 31, 2014
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	$ 161,180	$ 155,127
Amortizable intangible assets, accumulated amortization	(106,929)	(100,912)
Amortizable intangible assets, net carrying amount	54,251	54,215
Non-amortizable intangible assets	13,027	13,027
Gross carrying amount	174,207	168,154
Net carrying amount	67,278	67,242
Patents and Acquired Technologies
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	80,908	78,253
Amortizable intangible assets, accumulated amortization	(64,274)	(62,010)
Amortizable intangible assets, net carrying amount	16,634	16,243
Customer Relationships
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	65,102	63,029
Amortizable intangible assets, accumulated amortization	(34,275)	(31,531)
Amortizable intangible assets, net carrying amount	30,827	31,498
Customer Backlog
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	2,447	1,810
Amortizable intangible assets, accumulated amortization	(2,083)	(1,641)
Amortizable intangible assets, net carrying amount	364	169
Non-compete Covenant
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	2,514	1,830
Amortizable intangible assets, accumulated amortization	(613)	(366)
Amortizable intangible assets, net carrying amount	1,901	1,464
Trademarks and Trade Names
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	10,209	10,205
Amortizable intangible assets, accumulated amortization	(5,684)	(5,364)
Amortizable intangible assets, net carrying amount	$ 4,525	$ 4,841