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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2021, there were 895,295 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— — — — — — — — 
Granted— — — — — — — — 
Exercised/vested— — — — (35,131)92.27 (478,693)61.41 
Forfeited/expired— — (6,991)91.57 (1,115)92.27 — — 
Balance, March 31, 202152,860 $75.47 463,368 $86.16 165,011 $73.86 1,260,866 $67.89 
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
March 31,
20212020
New shares issued from available authorized shares— — 
Shares issued from available treasury stock513,824 66,215 
Total513,824 66,215 
Proceeds from stock option exercises$29,397 $1,463 
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
March 31,
20212020
Non-vested stock awards/stock units$1,883 $2,264 
Performance stock units643 248 
Total$2,526 $2,512 
Income tax benefit$367 $465 
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense at March 31, 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$15,907 
Performance stock units6,288 
Total$22,195