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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Awards | The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
|  | Year Ended December 31,
Restricted Shares and Performance-Based Shares |  | 2019 |  | 2018 |  | 2017
Expected quarterly dividends per share |  | $ | 0.2900 |  |  | $ | 0.2650 |  |  | $ | 0.2425 |
Risk-free interest rate |  | 2.47 | % |  | 2.38 | % |  | 1.50 | %
Market-Based Shares |  |  |  |  |  |
Dividend yield |  | 2.59 | % |  | 2.96 | % |  | 2.67 | %
Expected volatility |  | 19.55 | % |  | 19.12 | % |  | 20.80 | %
Risk-free interest rate |  | 2.51 | % |  | 2.36 | % |  | 1.54 | %
The following table summarizes activity in restricted stock awards, including performance-based and market-based shares, and stock options:
|  | Restricted Stock |  | Stock Options
|  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2018 |  | 166,651 |  |  | $ | 32.93 |  |  | 81,000 |  |  | $ | 11.94 |
Granted |  | 134,573 |  |  | 37.92 |  |  | — |  |  | — |
Exercised |  | (138,001 | ) |  | 31.44 |  |  | (79,000 | ) |  | 11.93 |
Forfeited |  | (1,681 | ) |  | 39.61 |  |  | — |  |  | — |
Expired |  | — |  |  | — |  |  | — |  |  | — |
Outstanding at December 31, 2019 |  | 161,542 |  |  | $ | 38.21 |  |  | 2,000 |  |  | $ | 12.22 |
The following table provides additional information concerning restricted stock activity, including performance-based and market-based shares, and stock options:
|  | Year Ended December 31,
Restricted Stock |  | 2019 |  | 2018 |  | 2017
Weighted-average grant date fair value |  | $ | 37.92 |  |  | $ | 29.65 |  |  | $ | 23.06 |
Total fair value of restricted shares that vested (in thousands) |  | $ | 6,246 |  |  | $ | 8,558 |  |  | $ | 5,747 |
Stock Options |  |  |  |  |  |
Total intrinsic value of options exercised (in thousands) |  | $ | 2,617 |  |  | $ | 3,117 |  |  | $ | 2,234 |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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