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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, 2015 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Numerator for basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Vishay stockholders | $ (137,815) |  | $ (27,666) |  | $ 26,268 |  | $ 30,699 |  | $ 29,206 |  | $ 26,971 |  | $ 35,642 |  | $ 25,810 |  | $ (108,514) | $ 117,629 | $ 122,980
Interest savings assuming conversion of dilutive convertible and exchangeable notes, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 59 | 140
Numerator for diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) attributed to Vishay stockholders - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (108,514) | $ 117,688 | $ 123,120
Denominator for basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147,570 | 147,448 | 144,856
Incremental outstanding phantom stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130 | 119 | 107
Adjusted weighted average shares outstanding - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147,700 | 147,567 | 144,963
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible and exchangeable debt instruments (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 5,890 | 6,130
Restricted stock units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 252 | 320
Other (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 7 | 4
Dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,149 | 6,454
Denominator for diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted average shares - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147,700 | 153,716 | 151,417
Basic earnings per share attributable to Vishay stockholders (in dollars per share) | $ (0.93) | [1] | $ (0.19) | [1] | $ 0.18 | [1] | $ 0.21 | [1] | $ 0.20 | [1] | $ 0.18 | [1] | $ 0.24 | [1] | $ 0.17 | [1] | $ (0.73) | $ 0.80 | $ 0.85
Diluted earnings per share attributable to Vishay stockholders (in dollars per share) | (0.93) | [1] | $ (0.19) | [1] | $ 0.17 | [1] | $ 0.20 | [1] | $ 0.19 | [1] | $ 0.17 | [1] | $ 0.23 | [1] | $ 0.17 | [1] | $ (0.73) | $ 0.77 | $ 0.81
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,477 | 0 | 19,809
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) | 13.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.39 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,151 | 7,944 | 7,885
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) | 18.34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.34 |  |
Convertible Senior Debentures 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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,133 | 0 | 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) | $ 11.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.38 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,512 | 0 | 0
Weighted average 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 | 91
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,014 | 706 | 907
[1] | May not add due to differences in weighted average share counts.

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