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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2021
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:
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands, except per share amounts) |
Net income for basic and diluted net income per share |  | $ | 1,014,589 |  |  | $ | 784,147 |  |  | $ | 467,468 |
Weighted average common shares-basic |  |  | 164,960 |  |  |  | 166,120 |  |  |  | 170,425 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |  |
Convertible note hedge warrant shares (1) |  |  | 9,956 |  |  |  | 6,989 |  |  |  | 2,698 |
Incremental shares from assumed conversion of convertible notes (2) |  |  | 7,435 |  |  |  | 8,528 |  |  |  | 4,909 |
Restricted stock units |  |  | 1,180 |  |  |  | 1,264 |  |  |  | 1,236 |
Stock options |  |  | 86 |  |  |  | 131 |  |  |  | 178 |
Employee stock purchase rights |  |  | 8 |  |  |  | 10 |  |  |  | 13 |
Dilutive potential common shares |  |  | 18,665 |  |  |  | 16,922 |  |  |  | 9,034 |
Weighted average common shares-diluted |  |  | 183,625 |  |  |  | 183,042 |  |  |  | 179,459 |
Net income per common share-basic |  | $ | 6.15 |  |  | $ | 4.72 |  |  | $ | 2.74 |
Net income per common share-diluted |  | $ | 5.53 |  |  | $ | 4.28 |  |  | $ | 2.60 |
(1) | Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.55, multiplied by 14.6 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.
(2) | Incremental shares from the 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 $31.52, multiplied by 4.4 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.

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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