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Equity Compensation Plans and Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
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, 2023, 2022 and 2021 (shares in thousands):

202320222021
Weighted-Weighted-Weighted-
AverageAverageAverage
UnderlyingFair ValueUnderlyingFair ValueUnderlyingFair Value
Sharesof GrantSharesof GrantSharesof Grant
Outstanding at beginning of year435 $67.38 383 $71.93 373 $77.40 
Performance-based grants (1)
107 91.76 120 69.78 105 58.68 
Time-based grants93 91.76 60 69.72 48 58.68 
Performance-based vested(211)65.54 — — (91)72.70 
Time-based vested(45)69.97 (19)70.33 (19)67.86 
Performance-based canceled
(10)72.37 (109)86.86 (18)72.56 
Time-based canceled  — — (15)72.49 
Outstanding at end of year369 $80.68 435 $67.38 383 $71.93 
(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.
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,
202320222021
Gross compensation costs:
Restricted stock unit awards$13,674 $10,853 $5,150 
Income tax benefits:
Restricted stock unit awards(605)(1,428)(205)
Net compensation expense$13,069 $9,425 $4,945