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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Estimated Fair Value of Stock Options | The fair value of each stock option granted in 2019, 2018 and 2017, was estimated on the date of grant using the following weighted-average assumptions.
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Dividend yield |  |  | 2.4 | % |  |  | 2.4 | % |  |  | 2.2 | %
Volatility |  |  | 23.3 | % |  |  | 25.4 | % |  |  | 29.6 | %
Risk-free interest rate |  |  | 2.5 | % |  |  | 2.9 | % |  |  | 1.8 | %
Expected life |  |  | 5.4 years |  |  |  | 5.4 years |  |  |  | 5.6 years |
Weighted average grant date fair value |  | $ | 4.35 |  |  | $ | 5.08 |  |  | $ | 5.17 |
Option Activity under Company's Stock Option Plans | The following table presents option activity under the Company’s stock option plans as of and for the year ended December 31, 2019.
|  | Number of Stock Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  | (In thousands) |  |  |  |  |  | (In years) |  |  | (In thousands) |
Outstanding at January 1, 2019 |  |  | 532 |  |  | $ | 16.73 |  |  |  |  |  |  |  |  |
Granted |  |  | 2 |  |  |  | 23.12 |  |  |  |  |  |  |  |  |
Exercised |  |  | (161 | ) |  |  | 13.78 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (14 | ) |  |  | 19.00 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2019 |  |  | 359 |  |  | $ | 17.99 |  |  |  | 6.05 |  |  | $ | 1,587 |
Vested or expected to vest at December 31, 2019 |  |  | 359 |  |  | $ | 17.99 |  |  |  | 6.05 |  |  | $ | 1,587 |
Exercisable at December 31, 2019 |  |  | 212 |  |  | $ | 15.58 |  |  |  | 4.76 |  |  | $ | 1,364 |
Summary of Status of Company's Non-Vested Restricted Shares | The table below summarizes activity related to the Company’s non-vested RSAs and RSUs for the year ended December 31, 2019.
|  | Shares |  |  | Weighted Average Fair Value |
|  | (In thousands) |  |  |  |
Nonvested at January 1, 2019 |  |  | 624 |  |  | $ | 21.56 |
Granted |  |  | 217 |  |  |  | 20.76 |
Vested |  |  | (220 | ) |  |  | 19.59 |
Forfeited |  |  | (180 | ) |  |  | 23.75 |
Nonvested at December 31, 2019 |  |  | 441 |  |  | $ | 21.25 |

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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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