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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2022, there were 788,070 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— — — — — — — — 
Granted5,382 133.67 3,460 132.72 — — — — 
Exercised/vested(16,022)74.89 — — (25,180)87.18 (103,060)62.97 
Forfeited/expired— — (3,167)94.57 (16,058)87.18 — — 
Balance, June 30, 202245,661 87.15 449,630 93.35 161,222 84.08 774,621 69.83 
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
June 30,		Six Months Ended
June 30,
2022202120222021
New shares issued from available authorized shares— — — — 
Shares issued from available treasury stock28,832 114,252 144,262 628,076 
Proceeds from stock option exercises$751 $7,285 $6,490 $36,682 
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
June 30,		Six Months Ended
June 30,
2022202120222021
Non-vested stock units$2,291 $1,768 $4,649 $3,651 
Deferred stock units720 700 720 700 
Performance stock units407 777 161 1,420 
Total$3,418 $3,245 $5,530 $5,771 
Income tax benefit$612 $514 $1,320 $881 
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense at June 30, 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$13,954 
Performance stock units8,256 
Total$22,210