Segment and Geographic Data (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments | Segment									6
Net revenues	$ 609,577	$ 628,329	$ 685,240	$ 745,159	$ 775,892	$ 780,972	$ 761,030	$ 716,795	$ 2,668,305	$ 3,034,689	$ 2,599,368
Gross profit	135,361	$ 150,079	$ 174,601	$ 211,159	219,690	$ 236,296	$ 227,238	$ 205,300	671,200	888,524	703,109
Segment Operating Income									543,696	755,888	581,740
Depreciation expense									155,985	150,056	148,883
Capital expenditures									156,641	229,899	170,432
Total Assets	3,120,775				3,106,198				3,120,775	3,106,198	3,462,089
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues									1,393,412	1,742,262	1,484,276
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues									1,082,701	1,085,292	931,291
EMS companies [Member]
Segment Reporting Information [Line Items]
Net revenues									192,192	207,135	183,801
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues									946,118	1,139,880	934,631
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues									830,876	861,436	727,220
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues									170,088	200,379	190,682
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues									182,781	228,831	198,850
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues									107,983	168,884	145,243
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues									119,361	144,433	160,038
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues									179,228	162,921	132,898
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues									131,870	127,925	109,806
Customers [Member]
Segment Reporting Information [Line Items]
Net revenues									2,668,305	3,034,689	2,599,368
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues									939,551	1,171,815	1,060,560
Asia [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues									965,030	1,193,827	1,091,107
Europe [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues									993,101	1,081,073	902,357
Americas [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues									710,174	759,789	605,904
MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues									509,145	547,643	467,476
Gross profit									126,026	145,923	109,603
Segment Operating Income									88,994	106,955	74,174
Depreciation expense									32,614	32,104	34,731
Capital expenditures									35,131	49,557	33,475
Total Assets	404,412				444,356				404,412	444,356	412,598
Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues									557,143	712,936	619,958
Gross profit									113,647	196,702	165,176
Segment Operating Income									94,130	175,752	145,645
Depreciation expense									38,930	38,197	37,396
Capital expenditures									38,242	57,756	38,681
Total Assets	755,945				804,784				755,945	804,784	792,610
Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues									222,986	289,727	284,429
Gross profit									53,463	100,219	98,000
Segment Operating Income									37,145	82,681	80,499
Depreciation expense									16,803	16,612	16,871
Capital expenditures									12,448	19,935	16,115
Total Assets	328,871				342,656				328,871	342,656	332,228
Resistors [Member]
Segment Reporting Information [Line Items]
Net revenues									657,192	716,394	590,465
Gross profit									186,707	238,356	179,443
Segment Operating Income									162,969	214,347	159,812
Depreciation expense									28,909	26,416	23,853
Capital expenditures									34,395	50,978	44,214
Total Assets	653,195				587,595				653,195	587,595	664,609
Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues									298,642	301,892	253,064
Gross profit									96,893	98,912	72,462
Segment Operating Income									86,395	89,224	63,066
Depreciation expense									13,316	11,292	10,230
Capital expenditures									17,836	29,884	22,793
Total Assets	334,791				287,240				334,791	287,240	330,030
Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues									423,197	466,097	383,976
Gross profit									94,464	108,412	78,425
Segment Operating Income									74,063	86,929	58,544
Depreciation expense									17,253	17,745	17,736
Capital expenditures									9,916	12,200	11,135
Total Assets	449,823				487,540				449,823	487,540	568,113
Corporate / Other [Member]
Segment Reporting Information [Line Items]
Net revenues									0	0	0
Gross profit									0	0	0
Segment Operating Income									0	0	0
Depreciation expense									8,160	7,690	8,066
Capital expenditures									8,673	9,589	4,019
Total Assets	$ 193,738				$ 152,027				193,738	152,027	361,901
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income									$ (257,127)	$ (270,768)	$ (246,462)