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Net Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Computation of Basic and Diluted Net Income (Loss) Per Common Share | The following table sets forth the computation of basic and diluted net income per common share:
|  | For the Three Months Ended |
|  | March 31, 2019 |  |  | April 1, 2018 |
|  | (in thousands, except per share amounts) |
Net income for basic and diluted net income per share |  | $ | 109,138 |  |  | $ | 86,974 |
Weighted average common shares-basic |  |  | 173,532 |  |  |  | 195,255 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |
Incremental shares from assumed conversion of convertible notes (1) |  |  | 2,186 |  |  |  | 4,398 |
Convertible note hedge warrant shares (2) |  |  | — |  |  |  | 1,830 |
Restricted stock units |  |  | 1,021 |  |  |  | 1,666 |
Stock options |  |  | 222 |  |  |  | 321 |
Employee stock purchase plan |  |  | 11 |  |  |  | 14 |
Dilutive potential common shares |  |  | 3,440 |  |  |  | 8,229 |
Weighted average common shares-diluted |  |  | 176,972 |  |  |  | 203,484 |
Net income per common share-basic |  | $ | 0.63 |  |  | $ | 0.45 |
Net income per common share-diluted |  | $ | 0.62 |  |  | $ | 0.43 |
| (1) | Incremental shares from assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.70, multiplied by 14.5 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
| (2) | Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.78, multiplied by 14.5 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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