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Net Income per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Computation of Basic and Diluted Net Income Per Common Share | The following table sets forth the computation of basic and diluted net income per common share from continuing and discontinued operations:
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | (in thousands, except per share amounts) |
Income from continuing operations |  | $ | 164,947 |  |  | $ | 217,049 |  |  | $ | 343,957 |
Income from discontinued operations |  |  | — |  |  |  | — |  |  |  | 1,545 |
Gain on disposal of discontinued operations |  |  | — |  |  |  | — |  |  |  | 24,371 |
Net income for basic and diluted net income per share |  | $ | 164,947 |  |  | $ | 217,049 |  |  | $ | 369,873 |
Weighted average common shares-basic |  |  | 190,772 |  |  |  | 186,878 |  |  |  | 184,683 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares from assumed conversion of convertible notes (1) |  |  | 23,341 |  |  |  | 22,367 |  |  |  | 21,504 |
Convertible note hedge warrant shares (2) |  |  | 18,795 |  |  |  | 17,433 |  |  |  | 16,224 |
Restricted stock units |  |  | 1,127 |  |  |  | 2,291 |  |  |  | 3,773 |
Stock options |  |  | 1,528 |  |  |  | 1,213 |  |  |  | 566 |
Employee stock purchase rights |  |  | 36 |  |  |  | 64 |  |  |  | 70 |
Dilutive potential common shares |  |  | 44,827 |  |  |  | 43,368 |  |  |  | 42,137 |
Weighted average common shares-diluted |  |  | 235,599 |  |  |  | 230,246 |  |  |  | 226,820 |
Net income per common shares-basic: |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.86 |  |  | $ | 1.16 |  |  | $ | 1.86 |
Discontinued operations |  |  | — |  |  |  | — |  |  |  | 0.14 |
|  | $ | 0.86 |  |  | $ | 1.16 |  |  | $ | 2.00 |
Net income per common shares-diluted: |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | 0.70 |  |  | $ | 0.94 |  |  | $ | 1.52 |
Discontinued operations |  |  | — |  |  |  | — |  |  |  | 0.11 |
|  | $ | 0.70 |  |  | $ | 0.94 |  |  | $ | 1.63 |
(1) | Incremental shares from assumed conversion of the convertible notes are calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by the 34.7 million shares that will be issued upon conversion. The result of this calculation, representing the total intrinsic value of the convertible debt, is divided by the average Teradyne stock price for the period.
(2) | Convertible notes hedge warrant shares are calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by the 34.7 million shares that will be issued upon exercise. The result of this calculation, representing the total intrinsic value of the warrant, is divided by the average Teradyne stock price for the period. Teradyne’s call option on its common stock (convertible note hedge transaction) is excluded from the calculation of diluted shares because the effect would be anti-dilutive. See Note H: “Debt” regarding convertible note hedge transaction.

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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/2003/role/presentationRef -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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