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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted and Deferred Stock Activity
A summary of restricted and deferred stock activity follows:
 Number of shares
Non-vested shares outstanding at January 1, 2023942,835 
Awarded:
Time-vesting847,358 
Performance-based190,515 
Released:
Time-vesting(319,071)
Performance-based(146,781)
Forfeitures:
Time-vesting(39,540)
Performance-based(30,604)
Non-vested shares outstanding at December 31, 20231,444,712 
Schedule of Average Grant-Date Fair Value of Restricted Stock
The average grant-date fair value of restricted stock awarded in 2023, 2022 and 2021 follows:

202320222021
Time-vesting$87.66 $96.29 $100.08 
Performance-based86.10 111.84 100.99 
Schedule of Weighted Average Assumptions on Performance-Based Shares
The fair values of the performance-based awards that include a market condition were calculated using a Monte Carlo valuation model and the following weighted average assumptions:
202320222021
Risk-free interest rate4.1 %1.0 %0.2 %
Expected term (years)333
Expected stock price volatility39.8 %34.8 %35.5 %