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Stock-based Compensation Plans | 9 Months Ended
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Sep. 29, 2019
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation Plans | Stock-based Compensation Plans The Company recognized stock-based compensation expense as follows for the periods indicated:
| THIRTEEN WEEKS ENDED |  | THIRTY-NINE WEEKS ENDED
(dollars in thousands) | SEPTEMBER 29, 2019 |  | SEPTEMBER 30, 2018 |  | SEPTEMBER 29, 2019 |  | SEPTEMBER 30, 2018
Stock options | $ | 1,316 |  |  | $ | 1,533 |  |  | $ | 3,888 |  |  | $ | 5,059 |
Restricted stock units | 2,389 |  |  | 2,323 |  |  | 6,548 |  |  | 7,110 |
Performance-based share units | 848 |  |  | 1,309 |  |  | 3,105 |  |  | 3,779 |
| $ | 4,553 |  |  | $ | 5,165 |  |  | $ | 13,541 |  |  | $ | 15,948 |
During the thirty-nine weeks ended September 29, 2019, the Company made grants of 1.2 million stock options, 0.6 million time-based restricted stock units and 0.2 million performance-based share units. Assumptions used in the Black-Scholes option pricing model and the weighted-average fair value of option awards granted were as follows for the periods indicated:
| THIRTY-NINE WEEKS ENDED
| SEPTEMBER 29, 2019 |  | SEPTEMBER 30, 2018
Assumptions: |  |  |
Weighted-average risk-free interest rate (1) | 2.34 | % |  | 2.66 | %
Dividend yield (2) | 1.94 | % |  | 1.50 | %
Expected term (3) | 4.8 years |  |  | 5.8 years |
Weighted-average volatility (4) | 31.05 | % |  | 32.76 | %
Weighted-average grant date fair value per option | $ | 5.07 |  |  | $ | 7.23 |
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(1) | Risk-free interest rate is the U.S. Treasury yield curve in effect as of the grant date for periods within the expected term of the option.
(2) | Dividend yield is the level of dividends expected to be paid on the Company’s common stock over the expected term of the option.
(3) | Expected term represents the period of time that the options are expected to be outstanding. The Company estimates the expected term based on historical exercise experience for its stock options.
(4) | Based on the historical volatility of the Company’s stock.
Restricted stock units granted prior to 2019 generally vest over a period of four years and restricted stock units granted after 2018 generally vest over a period of three years, in an equal number of shares each year. The following represents unrecognized stock compensation expense and the remaining weighted-average vesting period as of September 29, 2019:
| UNRECOGNIZED COMPENSATION EXPENSE (dollars in thousands) |  | REMAINING WEIGHTED-AVERAGE VESTING PERIOD (in years)
Stock options | $ | 9,115 |  |  | 2.1
Restricted stock units | $ | 16,848 |  |  | 2.2
Performance-based share units | $ | 7,003 |  |  | 1.4

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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