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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Target grants performance share
Target grants of performance shares outstanding at December 31, 2021, were as follows:
Grant DatePerformance
Period		Target Grant
of Shares
February 20202020-2022273,918 
February 20212021-2023281,129 
Schedule of share-based payment award, performance shares, valuation assumptions Assumptions used for grants applicable to the market condition for certain performance shares issued in 2021, 2020 and 2019 were:
2021 2020 2019 
Weighted average grant-date fair value$37.96 $40.75 $35.07 
Blended volatility range
35.37% - 46.35%
15.30% - 15.97%
19.50% - 19.69%
Risk-free interest rate range
.02% - .20%
1.45% - 1.62%
2.46% - 2.55%
Weighted average discounted dividends per share$3.16 $2.91 $2.85 
Summary of the status of the performance share awards
A summary of the status of the performance share awards for the year ended December 31, 2021, was as follows:
 Number of
Shares		Weighted
Average
Grant-Date
Fair Value
Nonvested at beginning of period613,174 $33.24 
Granted284,104 32.66 
Additional performance shares earned116,467 22.68 
Less:
Vested443,661 28.57 
Forfeited15,037 35.49 
Nonvested at end of period555,047 $34.40