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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Activity | The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
|  | Six Months Ended June 30, |  |
Restricted Shares and Performance Based Shares |  | 2020 |  | 2019
Expected quarterly dividends per share |  | $ | 0.3075 |  |  | $ | 0.2900 |
Risk-free interest rate |  | 0.72 | % |  | 2.47 | %
Market-Based Shares |  |  |  |
Dividend yield |  | 2.51 | % |  | 2.59 | %
Expected volatility |  | 19.41 |  |  | 19.55 |
Risk-free interest rate |  | 0.72 |  |  | 2.51 |
The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options, for the six months ended June 30, 2020:
| Restricted Stock |  |  |  | Stock Options |  |
| Shares |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Exercise Price
Outstanding at December 31, 2019 | 161,542 |  |  | $ | 38.21 |  |  | 2,000 |  |  | $ | 12.22 |
Granted | 246,029 |  |  | 36.73 |  |  | — |  |  | — |
Exercised | (238,054) |  |  | 34.86 |  |  | (2,000) |  |  | 12.22 |
Forfeited | (1,456) |  |  | 41.32 |  |  | — |  |  | — |
Outstanding at June 30, 2020 | 168,061 |  |  | $ | 40.77 |  |  | — |  |  | $ | — |
The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:
|  | Six Months Ended June 30, |  |
Restricted Stock |  | 2020 |  | 2019
Weighted-average grant date fair value |  | $ | 36.73 |  |  | $ | 37.92 |
Total fair value of restricted shares that vested (in thousands) |  | $ | 11,740 |  |  | $ | 6,227 |
Stock Options |  |  |  |
Total intrinsic value of options exercised (in thousands) |  | $ | 84 |  |  | $ | 2,617 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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