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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of restricted stock units, stock grants and stock units
The following table is a summary of awards granted and the weighted-average grant date fair value for each of the last three years:

Restricted Stock Units, Stock Grants, and Stock Units (a)Performance Shares (b)
 202120202019202120202019
Units granted152,345 118,403 109,106 161,840 122,830 142,874 
Weighted-average grant date fair value$76.72 $71.70 $89.15 $82.42 $104.74 $92.16 
(a)Units granted includes awards that will be cash settled of 51,074 in 2021, 45,646 in 2020, and 48,972 in 2019.
(b)Reflects the target payout level.
The following table is a summary of the status of non-vested awards as of December 31, 2021, and changes during the year:

Restricted Stock Units, Stock Grants, and Stock UnitsPerformance Shares
SharesWeighted-Average
Grant Date
Fair Value
Shares (b)Weighted-Average
Grant Date
Fair Value
Nonvested at January 1, 2021220,557 $77.93 260,004 $98.28 
Granted152,345 76.72 161,840 82.42 
Vested(115,099)80.50 (136,070)92.16 
Forfeited (c)(4,647)80.11 (5,092)95.07 
Nonvested at December 31, 2021253,156 (a)79.37 280,682 92.16 
Vested Awards Outstanding at December 31, 202188,706 136,070 
(a)Includes 118,538 of awards that will be cash settled.
(b)The nonvested performance shares are reflected at target payout level. 
(c)We account for forfeitures as they occur.
Summary of nonvested performance shares
The following table is a summary of awards granted and the weighted-average grant date fair value for each of the last three years:

Restricted Stock Units, Stock Grants, and Stock Units (a)Performance Shares (b)
 202120202019202120202019
Units granted152,345 118,403 109,106 161,840 122,830 142,874 
Weighted-average grant date fair value$76.72 $71.70 $89.15 $82.42 $104.74 $92.16 
(a)Units granted includes awards that will be cash settled of 51,074 in 2021, 45,646 in 2020, and 48,972 in 2019.
(b)Reflects the target payout level.
The following table is a summary of the status of non-vested awards as of December 31, 2021, and changes during the year:

Restricted Stock Units, Stock Grants, and Stock UnitsPerformance Shares
SharesWeighted-Average
Grant Date
Fair Value
Shares (b)Weighted-Average
Grant Date
Fair Value
Nonvested at January 1, 2021220,557 $77.93 260,004 $98.28 
Granted152,345 76.72 161,840 82.42 
Vested(115,099)80.50 (136,070)92.16 
Forfeited (c)(4,647)80.11 (5,092)95.07 
Nonvested at December 31, 2021253,156 (a)79.37 280,682 92.16 
Vested Awards Outstanding at December 31, 202188,706 136,070 
(a)Includes 118,538 of awards that will be cash settled.
(b)The nonvested performance shares are reflected at target payout level. 
(c)We account for forfeitures as they occur.