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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to VPG stockholders | $ 3,871 | $ 4,509 | $ 5,565 | $ 8,243 | $ 3,418 | $ 7,547 | $ 7,693 | $ 4,988 | $ 22,188 | $ 23,646 | $ 14,345
Adjustment to the numerator for net earnings: |  |  |  |  |  |  |  |  |  |  |
Interest savings assuming conversion of dilutive exchangeable notes, net of tax |  |  |  |  |  |  |  |  | 0 | 6 | 24
Numerator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to VPG stockholders |  |  |  |  |  |  |  |  | $ 22,188 | $ 23,652 | $ 14,369
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  |  |  |  |  |  |  | 13,515 | 13,439 | 13,262
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Exchangeable notes (in shares) |  |  |  |  |  |  |  |  | 0 | 22 | 145
Restricted stock units (in shares) |  |  |  |  |  |  |  |  | 82 | 74 | 64
Dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  | 82 | 96 | 209
Denominator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted average shares |  |  |  |  |  |  |  |  | 13,597 | 13,535 | 13,471
Basic earnings per share attributable to VPG stockholders (in dollars per share) | $ 0.29 | $ 0.33 | $ 0.41 | $ 0.61 | $ 0.25 | $ 0.56 | $ 0.57 | $ 0.37 | $ 1.64 | $ 1.76 | $ 1.08
Diluted earnings per share attributable to VPG stockholders (in dollars per share) | $ 0.28 | $ 0.33 | $ 0.41 | $ 0.61 | $ 0.25 | $ 0.56 | $ 0.57 | $ 0.37 | $ 1.63 | $ 1.75 | $ 1.07

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