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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Compensation Expense and Related Net Tax Benefits
The following table presents a summary of the total share-based compensation expense and the related net tax benefits associated with the Company’s various employee share-based compensation plans for the years ended December 31, 2023, 2022 and 2021:
Year Ended December 31,
($ in thousands)
202320222021
Stock compensation costs$39,867 $37,601 $32,567 
Related net tax benefits for stock compensation plans$8,959 $5,293 $1,760 
Summary of Activities for Time-Based and Performance-Based Restricted Stock Units
The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that were settled in shares for the year ended December 31, 2023. The number of performance-based RSUs stated below reflects the number of awards granted on the grant date:
Time-Based RSUsPerformance-Based RSUs
Shares
Weighted-Average Grant Date Fair Value
Shares
Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2023
1,296,866 $60.77 332,510 $60.40 
Granted515,218 $73.13 96,271 $79.93 
Vested(543,032)$40.93 (152,558)$39.79 
Forfeited(62,534)$74.04 — $— 
Outstanding, December 31, 2023
1,206,518 $74.29 276,223 $78.59