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Equity Compensation Plans and Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Stock Options Activity
The following table summarizes the restricted stock unit award activity for the years ended December 31, 2021, 2020 and 2019 (shares in thousands):

202120202019
Weighted-Weighted-Weighted-
AverageAverageAverage
UnderlyingFair ValueUnderlyingFair ValueUnderlyingFair Value
Sharesof GrantSharesof GrantSharesof Grant
Outstanding at beginning of year373 $77.40 357 $69.13 254 $59.53 
Performance-based grants (1)
105 58.68 238 78.40 109 86.86 
Time-based grants48 58.68 21 84.93 19 86.86 
Performance-based vested(91)72.70 (117)48.25 (10)45.93 
Time-based vested(19)67.86 (12)76.84 (15)73.78 
Performance-based canceled (2)
(18)72.56 (114)84.93 — — 
Time-based canceled(15)72.49 — — — — 
Outstanding at end of year383 $71.93 373 $77.40 357 $69.13 

(1)Represents the maximum possible award. The Company’s level of achievement of the respective performance goals will result in actual vesting of between zero shares and the maximum share award. Performance-based grants for 2020 include 114 shares which were subsequently cancelled in 2020 as described in footnote (2) below.

(2)Performance-based canceled for 2020 represents cancellation of performance-based awards granted in January of 2020 that were subsequently replaced with a new performance-based award granted in December 2020. The grant date fair value of the December 2020 replacement performance-based awards was $72.37 per share.
Schedule of Stock Options Activity
The following table summarizes stock option activity for the years ended December 31, 2021, 2020 and 2019 (shares in thousands):

202120202019
Weighted-Weighted-Weighted-
AverageAverageAverage
UnderlyingExerciseUnderlyingExerciseUnderlyingExercise
SharesPriceSharesPriceSharesPrice
Outstanding at beginning of year10 $38.00 70 $38.86 80 $39.00 
Exercised(10)38.00 (60)39.00 (10)40.00 
Outstanding at end of year  10 38.00 70 38.86 
Exercisable at end of year  — — 40 39.00 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The Company’s net income includes the following compensation costs related to share-based compensation arrangements (in thousands):

Year Ended December 31,
202120202019
Gross compensation costs:
Restricted stock unit awards$5,150 $2,899 $8,637 
Stock options 15 43 
Total gross compensation costs5,150 2,914 8,680 
Income tax benefits:
Restricted stock unit awards(205)(901)(302)
Exercise of stock options (94)(114)
Total income tax benefits(205)(995)(416)
Net compensation expense$4,945 $1,919 $8,264