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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2016 | Oct. 03, 2015 | Oct. 01, 2016 | Oct. 03, 2015
Numerator for basic earnings per share: |  |  |  |
Net earnings attributable to Vishay stockholders | $ 36,440 | $ (27,666) | $ 97,540 | $ 29,301
Adjustment to the numerator for continuing operations and net earnings: |  |  |  |
Interest savings assuming conversion of dilutive convertible and exchangeable notes, net of tax | 0 | 0 | 38 | 50
Numerator for diluted earnings per share: |  |  |  |
Net earnings attributable to Vishay stockholders - diluted | $ 36,440 | $ (27,666) | $ 97,578 | $ 29,351
Denominator for basic earnings per share: |  |  |  |
Weighted average shares | 146,781 | 147,570 | 147,327 | 147,570
Outstanding phantom stock units | 143 | 131 | 143 | 130
Adjusted weighted average shares (basic) | 146,924 | 147,701 | 147,470 | 147,700
Effect of dilutive securities: |  |  |  |
Convertible and exchangeable debt instruments | 2,541 | 0 | 2,387 | 3,692
Restricted stock units | 423 | 0 | 266 | 213
Other | 6 | 0 | 2 | 2
Dilutive potential common shares | 2,970 | 0 | 2,655 | 3,907
Denominator for diluted earnings per share: |  |  |  |
Adjusted weighted average shares (diluted) | 149,894 | 147,701 | 150,125 | 151,607
Basic earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.25 | $ (0.19) | $ 0.66 | $ 0.20
Diluted earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.24 | $ (0.19) | $ 0.65 | $ 0.19
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 0 | 20,364 | 13,750 | 13,537
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share) | $ 13.19 |  | $ 13.19 |
Convertible Senior Debentures, Due 2041 [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 8,268 | 8,106 | 8,229 | 8,063
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share) | $ 18.08 |  | $ 18.08 |
Convertible Senior Debentures, Due 2042 [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 0 | 13,060 | 0 | 4,353
Minimum market price of common stock for inclusion of shares issuable upon conversion of senior debentures for calculation of diluted earnings per share (in dollars per share) | $ 11.22 |  | $ 11.22 |
Weighted average employees stock options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 77 | 105 | 96 | 96
Weighted average other [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 415 | 1,059 | 545 | 768
Exchangeable Unsecured Notes, Due 2102 [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount (in shares) | 0 | 2,512 | 0 | 0

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