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Stock-Based Compensation and Directors Stock Purchase Plan (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023 and changes during the year then ended is presented below.

 

Shares
Weighted Average Grant Date Fair Value
Nonvested at January 1, 20231,206,004 $55.43 
Granted331,889 59.11 
Vested(341,152)48.30 
Forfeited(30,406)58.13 
Nonvested at December 31, 20231,166,335 $58.48 
Summary Of SAR Activity A summary of SAR activity during 2023 is presented below.
(Dollars in thousands, except per share data)
SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual TermAggregate Intrinsic Value
Outstanding at January 1, 2023995,591 $44.59 
Granted
94,173 62.52 
Forfeited
(5,250)60.99 
Expired
(6,114)49.63 
Exercised
(55,079)26.33 
Outstanding at December 31, 2023
1,023,321 $47.10 4.8years$9,189 
Exercisable at December 31, 2023
786,452 $42.66 3.9years$9,132 
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block] The per share average fair value and the model assumptions for SARs granted during the past three years are shown in the table below.
202320222021
Weighted per share average fair value at grant date$17.76 $15.80 $14.50 
Assumptions:
Dividend yield
1.6 %1.5 %1.4 %
Volatility
27.9 %28.4 %28.2 %
Risk-free interest rate
3.9 %1.6 %.7 %
Expected term
5.8 years5.7 years5.7 years
Schedule Of Additional Information About Stock Options and SARs Exercises
Additional information about SARs exercised is presented below.

(In thousands)202320222021
Intrinsic value of SARs exercised
$1,723 $2,448 $7,664 
Tax benefit realized SARs exercised
362 462 1,488