Segment and Geographic Data (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments | Segment	6
Net revenues	$ 2,501,898	$ 2,668,305	$ 3,034,689
Gross profit	581,903	671,200	888,524
Segment Operating Income	455,942	543,696	755,888
Depreciation expense	158,117	155,985	150,056
Capital expenditures	123,599	156,641	229,899
Total Assets	3,154,473	3,120,775	3,106,198
Distributors [Member]
Segment Reporting Information [Line Items]
Net revenues	1,328,953	1,393,412	1,742,262
OEMs [Member]
Segment Reporting Information [Line Items]
Net revenues	1,003,090	1,082,701	1,085,292
EMS companies [Member]
Segment Reporting Information [Line Items]
Net revenues	169,855	192,192	207,135
Industrial [Member]
Segment Reporting Information [Line Items]
Net revenues	864,032	946,118	1,139,880
Automotive [Member]
Segment Reporting Information [Line Items]
Net revenues	796,853	830,876	861,436
Telecommunications [Member]
Segment Reporting Information [Line Items]
Net revenues	109,001	170,088	200,379
Computing [Member]
Segment Reporting Information [Line Items]
Net revenues	204,166	182,781	228,831
Consumer Products [Member]
Segment Reporting Information [Line Items]
Net revenues	118,896	107,983	168,884
Power Supplies [Member]
Segment Reporting Information [Line Items]
Net revenues	116,966	119,361	144,433
Military and Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	162,484	179,228	162,921
Medical [Member]
Segment Reporting Information [Line Items]
Net revenues	129,500	131,870	127,925
Customers [Member]
Segment Reporting Information [Line Items]
Net revenues	2,501,898	2,668,305	3,034,689
Asia [Member]
Segment Reporting Information [Line Items]
Net revenues	1,017,160	939,551	1,171,815
Asia [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues	1,028,073	965,030	1,193,827
Europe [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues	854,847	993,101	1,081,073
Americas [Member] | Customers [Member]
Segment Reporting Information [Line Items]
Net revenues	618,978	710,174	759,789
MOSFETS [Member]
Segment Reporting Information [Line Items]
Net revenues	501,380	509,145	547,643
Gross profit	114,236	126,026	145,923
Segment Operating Income	76,548	88,994	106,955
Depreciation expense	30,835	32,614	32,104
Capital expenditures	18,621	35,131	49,557
Total Assets	447,867	404,412	444,356
Diodes [Member]
Segment Reporting Information [Line Items]
Net revenues	502,548	557,143	712,936
Gross profit	90,004	113,647	196,702
Segment Operating Income	69,663	94,130	175,752
Depreciation expense	39,380	38,930	38,197
Capital expenditures	31,960	38,242	57,756
Total Assets	704,606	755,945	804,784
Optoelectronic Components [Member]
Segment Reporting Information [Line Items]
Net revenues	236,616	222,986	289,727
Gross profit	66,502	53,463	100,219
Segment Operating Income	50,369	37,145	82,681
Depreciation expense	16,003	16,803	16,612
Capital expenditures	12,873	12,448	19,935
Total Assets	341,517	328,871	342,656
Resistors [Member]
Segment Reporting Information [Line Items]
Net revenues	606,183	657,192	716,394
Gross profit	153,214	186,707	238,356
Segment Operating Income	130,700	162,969	214,347
Depreciation expense	32,531	28,909	26,416
Capital expenditures	21,298	34,395	50,978
Total Assets	693,251	653,195	587,595
Inductors [Member]
Segment Reporting Information [Line Items]
Net revenues	293,629	298,642	301,892
Gross profit	92,500	96,893	98,912
Segment Operating Income	82,472	86,395	89,224
Depreciation expense	13,821	13,316	11,292
Capital expenditures	20,730	17,836	29,884
Total Assets	330,092	334,791	287,240
Capacitors [Member]
Segment Reporting Information [Line Items]
Net revenues	361,542	423,197	466,097
Gross profit	70,010	94,464	108,412
Segment Operating Income	50,753	74,063	86,929
Depreciation expense	17,349	17,253	17,745
Capital expenditures	11,198	9,916	12,200
Total Assets	438,906	449,823	487,540
Corporate / Other [Member]
Segment Reporting Information [Line Items]
Net revenues	0	0	0
Gross profit	(4,563)	0	0
Segment Operating Income	(4,563)	0	0
Depreciation expense	8,198	8,160	7,690
Capital expenditures	6,919	8,673	9,589
Total Assets	198,234	193,738	152,027
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Segment Operating Income	$ (246,940)	$ (257,127)	$ (270,768)