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Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2020
Retirement Benefits [Abstract] |
Fair value of options granted | The following table summarizes the weighted-average assumptions used to compute the fair value of options granted to employees:
| For the Three Months Ended March 31,
| 2020 |  | 2019
Risk-free interest rate | 1.4% |  | 2.5%
Expected life of options — years | 3.82 |  | 3.36
Expected stock price volatility | 25% |  | 26%
Expected dividend yield | 0.7% |  | 0.8%
Stock options activity under share-based payment plans | The following table summarizes stock option activity under our share-based plans for the three months ended March 31, 2020:
| Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2019 | 208 |  |  | $ | 4.46 |  |  |  |  |
Granted | 7 |  |  | $ | 7.20 |  |  |  |  |
Exercised | (11 | ) |  | $ | 4.17 |  |  |  |  |
Forfeited, cancelled or expired | (1 | ) |  | $ | 5.93 |  |  |  |  |
Outstanding as of March 31, 2020 | 203 |  |  | $ | 4.56 |  |  | 5.51 |  | $ | 165 |
Exercisable as of March 31, 2020 | 144 |  |  | $ | 4.03 |  |  | 4.67 |  | $ | 153 |
Summary of restricted stock unit and stock award activity | The following table summarizes the restricted stock unit, including PRSU, activity under our share-based plans for the three months ended March 31, 2020:
| Shares |  | Grant Date Fair Value Per Share
Nonvested as of December 31, 2019 | 75 |  |  | $ | 5.95 |
Granted | 6 |  |  | $ | 7.18 |
Vested | (8 | ) |  | $ | 5.81 |
Forfeited | (2 | ) |  | $ | 5.94 |
Nonvested as of March 31, 2020 | 71 |  |  | $ | 6.07 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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