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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | [1] | Sep. 29, 2018 | [1] | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jul. 01, 2017 | [1] | Apr. 01, 2017 | [1] | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to VPG stockholders | $ 3,418 |  | $ 7,547 |  | $ 7,693 |  | $ 4,988 |  | $ 4,476 |  | $ 4,255 |  | $ 3,619 |  | $ 1,995 |  | $ 23,646 | $ 14,345 | $ 6,404
Adjustment to the numerator for net earnings: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest savings assuming conversion of dilutive exchangeable notes, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 24 | 18
Numerator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to VPG stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,652 | $ 14,369 | $ 6,422
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,439 | 13,262 | 13,187
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable notes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22 | 145 | 181
Restricted stock units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74 | 64 | 51
Dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96 | 209 | 232
Denominator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,535 | 13,471 | 13,419
Basic earnings per share attributable to VPG stockholders (in dollars per share) | $ 0.25 | [2] | $ 0.56 | [2] | $ 0.57 | [2] | $ 0.37 | [2] | $ 0.34 | [2] | $ 0.32 | [2] | $ 0.27 | [2] | $ 0.15 | [2] | $ 1.76 | $ 1.08 | $ 0.49
Diluted earnings per share attributable to VPG stockholders (in dollars per share) | $ 0.25 | [2] | $ 0.56 | [2] | $ 0.57 | [2] | $ 0.37 | [2] | $ 0.33 | [2] | $ 0.32 | [2] | $ 0.27 | [2] | $ 0.15 | [2] | $ 1.75 | $ 1.07 | $ 0.48
[1] | The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.
[2] | Quarterly amounts may not agree in total to the corresponding annual amounts due to rounding.

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