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Stock-Based Compensation and Directors Stock Purchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary Of The Status Of Nonvested Share Awards | Nonvested Restricted Stock Awards Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2020 and changes during the year then ended is presented below.
| Shares | Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020 | 1,159,180 |  | $ | 45.30 |
Granted | 244,468 |  | 60.90 |
Vested | (292,100) |  | 32.40 |
Forfeited | (11,682) |  | 51.77 |
Nonvested at December 31, 2020 | 1,099,866 |  | $ | 52.11 |
Summary Of SAR Activity |
(Dollars in thousands, except per share data) | Shares | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term | Aggregate Intrinsic Value
Outstanding at January 1, 2020 | 1,101,905 |  | $ | 41.48 |  |  |
Granted | 108,262 |  | 60.17 |  |  |
Forfeited | (7,717) |  | 55.27 |  |  |
Expired | (576) |  | 51.70 |  |  |
Exercised | (195,978) |  | 33.43 |  |  |
Outstanding at December 31, 2020 | 1,005,896 |  | $ | 44.95 |  | 6.2 | years | $ | 20,875 |
Exercisable at December 31, 2020 | 600,469 |  | $ | 38.30 |  | 5.0 | years | $ | 16,452 |
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block] |
| 2020 | 2019 | 2018
Weighted per share average fair value at grant date | $9.64 |  | $10.81 |  | $10.74 |
Assumptions: |  |  |
Dividend yield | 1.7 | % | 1.7 | % | 1.6 | %
Volatility | 20.2 | % | 19.8 | % | 20.6 | %
Risk-free interest rate | 1.0 | % | 2.6 | % | 2.7 | %
Expected term | 5.8 years | 6.0 years | 6.6 years
Schedule Of Additional Information About Stock Options and SARs Exercises | Additional information about stock options and SARs exercised is presented below.
(In thousands) | 2020 | 2019 | 2018
Intrinsic value of options and SARs exercised | $ | 6,278 |  | $ | 7,109 |  | $ | 9,632 |
Tax benefit realized from options and SARs exercised | $ | 1,252 |  | $ | 1,385 |  | $ | 1,928 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired 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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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