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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Activity in Corporation's Active Stock Plans
A combined summary of activity in our active stock plans is presented in the table. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria. As of September 30, 2021, there were 917,440 shares remaining available for grant for future stock-based compensation awards.
Director Deferred
Stock Units
Outstanding		Non-Vested Stock
Awards/Stock Units
Outstanding		Performance Stock Units OutstandingStock Options
Outstanding
Number of UnitsWeighted-
Average
Fair Value
at Grant		Number
of Shares/Units		Weighted-
Average
Fair Value
at Grant		Number of UnitsWeighted-
Average
Fair Value
at Grant		Number
of Shares		Weighted-
Average
Exercise
Price
Balance, January 1, 202152,860 $75.47 470,359 $86.24 201,257 $77.18 1,739,559 $66.11 
Authorized— — — — — — — — 
Granted5,940 117.90 — — — — — — 
Exercised/vested(2,499)92.03 (1,213)98.90 (35,131)92.27 (611,201)61.86 
Forfeited/expired— — (26,439)87.08 (9,752)75.70 — — 
Balance, September 30, 202156,301 $79.21 442,707 $86.16 156,374 $73.88 1,128,358 $68.41 
Shares Issued in Connection with Stock Compensation Awards Shares issued in connection with stock compensation awards along with other related information were as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
New shares issued from available authorized shares— — — — 
Shares issued from available treasury stock21,968 53,425 650,044 196,948 
Total21,968 53,425 650,044 196,948 
Proceeds from stock option exercises$1,128 $2,698 $37,810 $7,544 
Share-based Payment Arrangement, Cost by Plan
Stock-based compensation expense and the related income tax benefit is presented in the following table.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Non-vested stock awards/stock units$1,559 $1,999 $5,210 $6,325 
Director deferred stock units— — 700 770 
Performance stock units426 444 1,846 1,132 
Total$1,985 $2,443 $7,756 $8,227 
Income tax benefit$281 $450 $1,162 $1,539 
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense at September 30, 2021 is presented in the table below. Unrecognized stock-based compensation expense related to performance stock units is presented assuming attainment of the maximum payout rate as set forth by the performance criteria.
Non-vested stock awards/stock units$10,918 
Performance stock units4,450 
Total$15,368