Stockholders' Equity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) shares Vote
Class of Stock [Line Items]
Shares reserved (in shares)	34,483,471
Revolving Credit Facility [Member]
Class of Stock [Line Items]
Restricted payments (annual limit) | $	$ 100,000
Restricted payments (total limit) | $	300,000
Restricted payments (rollover limit) | $	$ 25,000
Restricted payments pro forma ratio	2.50
Class B Convertible Common Stock [Member]
Class of Stock [Line Items]
Voting rights per share | Vote	10
Conversion feature	one-for-one
Shares reserved (in shares)	12,097,148
Common Stock [Member]
Class of Stock [Line Items]
Voting rights per share | Vote	1
Restricted stock units outstanding [Member]
Class of Stock [Line Items]
Shares reserved (in shares)	793,000
Available to grant 2007 Stock Incentive Program - [Member]
Class of Stock [Line Items]
Shares reserved (in shares)	2,307,000
Phantom stock units outstanding [Member]
Class of Stock [Line Items]
Shares reserved (in shares)	198,000
Convertible Senior Debentures, Due 2040 [Member]
Class of Stock [Line Items]
Shares reserved (in shares)	27,600	[1]
Number of shares debentures are convertible into (in shares)	24,544
Convertible Senior Notes, Due 2025 [Member]
Class of Stock [Line Items]
Shares reserved (in shares)	19,060,723	[1]
Number of shares debentures are convertible into (in shares)	14,836,842

[1] At December 31, 2020, the convertible senior debentures due 2040 are convertible into 24,544 shares of Vishay common stock.  Based on the effective conversion rate at December 31, 2020, the convertible senior notes due 2025 would be convertible into 14,836,842 shares of Vishay common stock.  The Company has reserved adequate shares to ensure it could issue the maximum amount of shares to be delivered upon a make-whole fundamental change as defined in the indentures governing the convertible debt instruments.