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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2013
Stock-Based Compensation | H. Stock-Based Compensation Restricted stock unit awards granted to employees vest in equal installments over four years. A portion of restricted stock unit awards granted to executive officers is subject to time-based vesting and a portion is subject to performance-based vesting. The percentage level of performance satisfied for performance-based grants is assessed on or near the anniversary of the grant date and, in turn, that percentage level determines the number of performance-based restricted stock units available for vesting over the vesting period; portions of the performance-based grants not available for vesting will be forfeited. Stock options vest in equal installments over four years, and have a term of seven years from the date of grant. During the six months ended June 30, 2013, Teradyne granted 1.9 million of restricted stock unit awards to employees at a weighted average grant date fair value of $16.60 and 0.2 million of service-based stock options to executive officers at a weighted average grant date fair value of $6.09. During the six months ended July 1, 2012, Teradyne granted 1.6 million of restricted stock unit awards to employees at a weighted average grant date fair value of $16.83 and 0.2 million of service-based stock options to executive officers at a weighted average grant date fair value of $6.85. The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | For the Six Months Ended |
|  | June 30, 2013 |  |  | July 1, 2012 |
Expected life (years) |  |  | 4.0 |  |  |  | 3.5 |
Interest rate |  |  | 0.6 | % |  |  | 0.4 | %
Volatility-historical |  |  | 46.8 | % |  |  | 56.0 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Teradyne determined the stock options’ expected life based upon historical exercise data for executive officers, the age of the executive officers and the terms of the stock option grant. Volatility was determined using historical volatility for a period equal to the expected life. The risk-free rate was determined using the U.S. Treasury yield curve in effect at the time of grant. Effective January 1, 2013, the price paid by employees for Teradyne’s common stock purchased through the employee stock purchase plan is equal to 85% of the stock price on the last business day of the purchase period. During 2012, the price paid by employees for Teradyne’s common stock purchased through the employee stock purchase plan was equal to 85% of the lower of the stock price on the first or last business day of the purchase period. The weighted-average fair value of employee stock purchase rights granted in the six months ended July 1, 2012 was $4.09. The fair value of the employees’ purchase rights granted in the six months ended July 1, 2012 was estimated using the Black-Scholes option-pricing model with the following assumptions:
|  | For the Six Months Ended July 1, 2012 |
Expected life (years) |  |  | 0.5 |
Interest rate |  |  | 0.06 | %
Volatility-historical |  |  | 52.6 | %
Dividend yield |  |  | 0.0 | %

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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