Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance at beginning of period				$ 138,244				$ 144,359	$ 138,244	$ 144,359
Goodwill impairment loss	$ 0	$ 0	$ 0	0	$ 0	$ (5,380)	$ 0	0	0	(5,380)	$ 0
Exchange rate effects									(322)	(735)
Balance at end of period	141,407				138,244				141,407	138,244	144,359
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	0				20,359				0	20,359
Intangible Assets Subject to Amortization	287,053				270,179				287,053	270,179
Accumulated amortization	(202,590)				(187,280)				(202,590)	(187,280)
Net Intangible Assets Subject to Amortization	84,463				82,899				84,463	82,899
Intangible assets, net	84,463				103,258				84,463	103,258
Amortization expense (excluding capitalized software)									14,842	21,829	18,651
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2017	15,884								15,884
2018	11,096								11,096
2019	7,332								7,332
2020	6,567								6,567
2021	5,787								5,787
Sonntag [Member]
Goodwill [Roll Forward]
Goodwill acquired during period									3,485
Capella Microsystems (Taiwan) Inc. [Member]
Goodwill [Roll Forward]
Impairment of Long-Lived Assets Held-for-use										57,600
Resistors And Inductors Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period				41,395				42,146	41,395	42,146
Goodwill impairment loss										0
Exchange rate effects									(322)	(751)
Balance at end of period	44,558				41,395				44,558	41,395	42,146
Resistors And Inductors Segment [Member] | Sonntag [Member]
Goodwill [Roll Forward]
Goodwill acquired during period									3,485
Capacitors Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period				0				5,364	0	5,364
Goodwill impairment loss										(5,380)
Exchange rate effects									0	16
Balance at end of period	0				0				0	0	5,364
Capacitors Segment [Member] | Sonntag [Member]
Goodwill [Roll Forward]
Goodwill acquired during period									0
Optoelectronic Components Segment [Member]
Goodwill [Roll Forward]
Balance at beginning of period				$ 96,849				$ 96,849	96,849	96,849
Goodwill impairment loss										0
Exchange rate effects									0	0
Balance at end of period	96,849				96,849				96,849	96,849	$ 96,849
Optoelectronic Components Segment [Member] | Sonntag [Member]
Goodwill [Roll Forward]
Goodwill acquired during period									0
Patents and Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	93,395				93,606				93,395	93,606
Accumulated amortization	(81,807)				(76,258)				(81,807)	(76,258)
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	53,807				53,401				53,807	53,401
Accumulated amortization	(49,388)				(47,394)				(49,388)	(47,394)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	84,905				85,418				84,905	85,418
Accumulated amortization	(42,787)				(37,989)				(42,787)	(37,989)
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	53,680				35,493				53,680	35,493
Accumulated amortization	(27,460)				(23,798)				(27,460)	(23,798)
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	1,266				2,261				1,266	2,261
Accumulated amortization	$ (1,148)				$ (1,841)				$ (1,148)	$ (1,841)