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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Apr. 02, 2016 | Apr. 04, 2015
Numerator for basic earnings per share: |  |
Net earnings attributable to Vishay stockholders | $ 28,014 | $ 30,699
Adjustment to the numerator for continuing operations and net earnings: |  |
Interest savings assuming conversion of dilutive convertible and exchangeable notes, net of tax | 38 | 16
Numerator for diluted earnings per share: |  |
Net earnings attributable to Vishay stockholders - diluted | $ 28,052 | $ 30,715
Denominator for basic earnings per share: |  |
Weighted average shares | 147,691 | 147,569
Outstanding phantom stock units | 142 | 129
Adjusted weighted average shares (basic) | 147,833 | 147,698
Effect of dilutive securities: |  |
Convertible and exchangeable debt instruments | 2,626 | 4,778
Restricted stock units | 169 | 184
Other | 0 | 6
Dilutive potential common shares | 2,795 | 4,968
Denominator for diluted earnings per share: |  |
Adjusted weighted average shares (diluted) | 150,628 | 152,666
Basic earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.19 | $ 0.21
Diluted earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.19 | $ 0.20
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) | 20,574 | 0
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) | $ 13.31 |
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) | 8,189 | 8,024
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) | $ 18.25 |
Convertible Senior Debentures, Due 2042 [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
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) | $ 11.32 |
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) | 105 | 77
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) | 610 | 620

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