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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
A combined summary of activity in our active stock plans is presented in the table below. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria. As of March 31, 2022, there were 794,493 shares remaining available for grant for future stock-based compensation awards.
Deferred
Stock Units
Outstanding		Non-Vested
Stock Units
Outstanding		Performance
Stock Units
Outstanding		Stock Options
Outstanding
Number
of Units		Weighted-
Average
Fair Value
at Grant		Number
of Units		Weighted-
Average
Fair Value
at Grant		Number
of Units		Weighted-
Average
Fair Value
at Grant		Number
of Shares		Weighted-
Average
Exercise
Price
Balance, January 1, 202256,301 $79.21 449,337 $93.05 202,460 $84.71 877,681 $69.02 
Authorized— — — — — — — — 
Granted— — 1,038 145.32 — — — — 
Exercised/vested— — — — (25,180)87.18 (90,250)63.59 
Forfeited/expired— — (1,786)89.50 (16,058)87.18 — — 
Balance, March 31, 202256,301 79.21 448,589 93.19 161,222 84.08 787,431 69.64 
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,
20222021
New shares issued from available authorized shares— — 
Shares issued from available treasury stock115,430 513,824 
Proceeds from stock option exercises$5,739 $29,397 
Share-based Payment Arrangement, Cost by Plan
Stock-based compensation expense or benefit and the related income tax benefit is presented in the following table. The service period for performance stock units granted each year begins on January 1 of the following year.
Three Months Ended
March 31,
20222021
Non-vested stock units$2,358 $1,883 
Performance stock units(246)643 
Total$2,112 $2,526 
Income tax benefit$708 $367 
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense at March 31, 2022 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 units$16,063 
Performance stock units8,664 
Total$24,727