Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 01, 2016	Dec. 31, 2015
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	$ 163,904	$ 165,858
Amortizable intangible assets, accumulated amortization	(113,963)	(112,616)
Amortizable intangible assets, net carrying amount	49,941	53,242
Non-amortizable intangible assets	13,027	13,027
Gross carrying amount	176,931	178,885
Net carrying amount	62,968	66,269
Patents and Acquired Technologies
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	80,977	82,821
Amortizable intangible assets, accumulated amortization	(65,636)	(66,297)
Amortizable intangible assets, net carrying amount	15,341	16,524
Customer Relationships
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	67,102	67,168
Amortizable intangible assets, accumulated amortization	(38,411)	(36,914)
Amortizable intangible assets, net carrying amount	28,691	30,254
Customer Backlog
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	2,644	2,644
Amortizable intangible assets, accumulated amortization	(2,602)	(2,589)
Amortizable intangible assets, net carrying amount	42	55
Non-compete Covenant
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	2,514	2,514
Amortizable intangible assets, accumulated amortization	(1,016)	(882)
Amortizable intangible assets, net carrying amount	1,498	1,632
Trademarks and Trade Names
Schedule of Intangible Assets Disclosure [Line Items]
Amortizable intangible assets, gross carrying amount	10,667	10,711
Amortizable intangible assets, accumulated amortization	(6,298)	(5,934)
Amortizable intangible assets, net carrying amount	$ 4,369	$ 4,777