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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2017 | Apr. 02, 2016
Numerator for basic earnings per share: |  |
Net earnings attributable to Vishay stockholders | $ 36,719 | $ 28,014
Adjustment to the numerator for continuing operations and net earnings: |  |
Interest savings assuming conversion of dilutive convertible and exchangeable notes, net of tax | 0 | 38
Numerator for diluted earnings per share: |  |
Net earnings attributable to Vishay stockholders - diluted | $ 36,719 | $ 28,052
Denominator for basic earnings per share: |  |
Weighted average shares | 146,120 | 147,691
Outstanding phantom stock units | 154 | 142
Adjusted weighted average shares (basic) | 146,274 | 147,833
Effect of dilutive securities: |  |
Convertible and exchangeable debt instruments | 8,349 | 2,626
Restricted stock units | 253 | 169
Dilutive potential common shares | 8,602 | 2,795
Denominator for diluted earnings per share: |  |
Adjusted weighted average shares (diluted) | 154,876 | 150,628
Basic earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.25 | $ 0.19
Diluted earnings per share attributable to Vishay stockholders (in dollars per share) | $ 0.24 | $ 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 | 20,574
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) | $ 13.09 |
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) | 8,340 | 8,189
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) | $ 17.93 |
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) | $ 11.13 |
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) | 0 | 105
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) | 581 | 610

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