Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 03, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 144,359
Goodwill, Impairment Loss	(5,380)
Goodwill, Translation Adjustments	(576)
Goodwill, Ending Balance	138,403
Impairment of Long-Lived Assets Held-for-use	57,600
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	20,359	$ 20,359
Intangible Assets Subject to Amortization	270,534	357,307
Accumulated Amortization	(183,115)	(191,053)
Finite-Lived Intangible Assets, Net, Total	87,419	166,254
Intangible Assets, Net (Excluding Goodwill), Total	107,778	186,613
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2015	4,135
2016	15,314
2017	13,162
2018	9,180
2019	5,343
Resistors And Inductors Segment [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	42,146
Goodwill, Impairment Loss	0
Goodwill, Translation Adjustments	(592)
Goodwill, Ending Balance	$ 41,554
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	200.00%
Capacitors Segment [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 5,364
Goodwill, Impairment Loss	(5,380)
Goodwill, Translation Adjustments	16
Goodwill, Ending Balance	0
Optoelectronic Components Segment [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	96,849
Goodwill, Impairment Loss	0
Goodwill, Translation Adjustments	0
Goodwill, Ending Balance	$ 96,849
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	130.00%
Patented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	$ 93,786	108,190
Accumulated Amortization	(74,959)	(71,700)
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	53,197	53,369
Accumulated Amortization	(46,976)	(45,979)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	85,526	153,853
Accumulated Amortization	(36,359)	(50,630)
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	35,758	39,612
Accumulated Amortization	(23,052)	(21,384)
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Subject to Amortization	2,267	2,283
Accumulated Amortization	$ (1,769)	$ (1,360)