Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	$ 66,487	$ 0	$ 0
Goodwill [Roll Forward]
Balance at beginning of period	201,416	201,432
Purchase price allocation adjustment		(2,639)
Impairment of goodwill	(66,487)	0	0
Exchange rate effects	(627)	410
Balance at end of period	179,005	201,416	201,432
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	212,347	195,008
Accumulated amortization	(125,124)	(122,675)
Net intangible assets subject to amortization	87,223	72,333
Intangible assets, net	87,223	72,333
Amortization expense (excluding capitalized software)	11,684	9,916	8,127
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2025	13,074
2026	12,267
2027	9,319
2028	8,346
2029	8,121
Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	11,685
Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	777
Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		2,213
Newport wafer fab [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	32,241
MOSFETs [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	66,487
Goodwill [Roll Forward]
Balance at beginning of period	34,246	36,885
Purchase price allocation adjustment		(2,639)
Impairment of goodwill	(66,487)
Exchange rate effects	0	0
Balance at end of period	0	34,246	36,885
MOSFETs [Member] | Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
MOSFETs [Member] | Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
MOSFETs [Member] | Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		0
MOSFETs [Member] | Newport wafer fab [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	32,241
Optoelectronic Components [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	0
Goodwill [Roll Forward]
Balance at beginning of period	96,849	96,849
Purchase price allocation adjustment		0
Impairment of goodwill	0
Exchange rate effects	0	0
Balance at end of period	96,849	96,849	96,849
Optoelectronic Components [Member] | Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Optoelectronic Components [Member] | Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Optoelectronic Components [Member] | Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		0
Optoelectronic Components [Member] | Newport wafer fab [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Resistors [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	0
Goodwill [Roll Forward]
Balance at beginning of period	44,506	41,883
Purchase price allocation adjustment		0
Impairment of goodwill	0
Exchange rate effects	(627)	410
Balance at end of period	55,564	44,506	41,883
Resistors [Member] | Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	11,685
Resistors [Member] | Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Resistors [Member] | Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		2,213
Resistors [Member] | Newport wafer fab [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Inductors [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	0
Goodwill [Roll Forward]
Balance at beginning of period	25,815	25,815
Purchase price allocation adjustment		0
Impairment of goodwill	0
Exchange rate effects	0	0
Balance at end of period	25,815	25,815	25,815
Inductors [Member] | Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Inductors [Member] | Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Inductors [Member] | Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		0
Inductors [Member] | Newport wafer fab [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Capacitors Segment [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Impairment of goodwill	0
Goodwill [Roll Forward]
Balance at beginning of period	0	0
Purchase price allocation adjustment		0
Impairment of goodwill	0
Exchange rate effects	0	0
Balance at end of period	777	0	$ 0
Capacitors Segment [Member] | Ametherm [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	0
Capacitors Segment [Member] | Birkelbach Kondensatortechnik GmbH [Member]
Goodwill [Roll Forward]
Goodwill acquired during period	777
Capacitors Segment [Member] | Centerline [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		0
Capacitors Segment [Member] | Newport wafer fab [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	23,160	26,053
Accumulated amortization	(7,316)	(14,931)
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	62,158	62,360
Accumulated amortization	(55,476)	(54,203)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	103,813	83,895
Accumulated amortization	(45,053)	(38,664)
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	23,216	22,300
Accumulated amortization	(17,279)	(14,610)
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	0	400
Accumulated amortization	$ 0	$ (267)