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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of unrecognized compensation cost, nonvested awards The following table represents expected amortization of the Company's non-vested shares issued as of December 31, 2024:
Dollars in millionsFUTURE AMORTIZATION
of non-vested shares
2025$8.4 
20265.5 
20273.2 
20281.3 
2029 and thereafter0.4 
Total$18.8 
Schedule of other than stock options, valuation assumptions Approximately 36% of the RSUs vest based on relative total shareholder return ("TSR") and were valued using independent specialists. The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair value of $19.10 for the relative TSR component for the February grants using the following assumptions:
Volatility28.0 %
Dividend assumptionAccrued
Expected term 3 years
Risk-free rate4.44 %
Stock price (per share)$15.22
The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair value of $14.94 for the relative TSR component for the April grants using the following assumptions:
Volatility29.0 %
Dividend assumptionAccrued
Expected term 3 years
Risk-free rate4.85 %
Stock price (per share)$14.23
The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair value of $9.62 for the relative TSR component for the February 2024 grant using the following assumptions:
Volatility28.0 %
Dividend assumptionAccrued
Expected term 3 years
Risk-free rate4.44 %
Stock price (per share)$15.22
Schedule of the activity under the incentive plans the previous directors' plan
The following table represents the summary of non-vested share-based awards (including restricted stock, RSUs, LTIP-C units and LTIP-D units) under the Incentive Plans and related information for the years ended December 31, 2024, 2023, and 2022: 
YEAR ENDED DECEMBER 31,
Dollars in thousands, except per share data202420232022
Share-based awards, beginning of year2,615,562 2,090,060 1,562,028 
Granted 1
1,732,484 1,164,359 952,407 
Vested(2,284,767)(403,266)(418,949)
Change in awards based on performance assessment 2
(47,202)(205,668)— 
Forfeited(216,340)(29,923)(5,426)
Share-based awards, end of year1,799,737 2,615,562 2,090,060 
Weighted-average grant date fair value of
Share-based awards, beginning of year$25.56 $30.35 $31.10 
Share-based awards granted during the year$15.49 $18.70 $29.64 
Share-based awards vested during the year$21.43 $28.38 $31.52 
Share-based awards change in performance assessment during the year$20.21 $29.05 $— 
Stock-based awards forfeited during the year$16.87 $31.16 $31.48 
Share-based awards, end of year$22.30 $25.56 $30.35 
Grant date fair value of shares granted during the year$26,844 $22,171 $28,225 
1LTIP-C units are issued at the maximum possible value of the award and are reflected as such in this table until the performance period has been satisfied and the exact number of awards are determinable.
2The Company's RSUs that are based on operating performance metrics are evaluated on the probability of those performance metrics being achieved. During 2023, the Company determined that the operating performance goals related to the RSUs issued in 2022 are not probable of being achieved and reversed all of the outstanding amortization expense for that grant. In addition, the Company lowered the probability of achieving the operating performance goals related to the RSUs issued in 2023.