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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Portion of Nonvested Common Shares Earned based upon Achievement of Compounded Annual Book Value per share Growth | The portion of the nonvested performance-based share awards that will be earned based upon the achievement of compounded annual book value per share growth is as follows:
|  | 2020 Performance-Based Grants |  | 2019 Performance-Based Grants |  | 2018 Performance-Based Grants
Performance level |  | Compounded Annual Book Value Per Share Growth |  | Nonvested Common Shares Earned |  | Compounded Annual Book Value Per Share Growth |  | Nonvested Common Shares Earned |  | Compounded Annual Book Value Per Share Growth |  | Nonvested Common Shares Earned
|  | <13 | % |  | 0 | % |  | <14 | % |  | 0 | % |  | <15 | % |  | 0 | %
Threshold |  | 13 | % |  | 10 | % |  | 14 | % |  | 10 | % |  | 15 | % |  | 25 | %
|  | 14 | % |  | 35 | % |  | 15 | % |  | 35 | % |  | 16 | % |  | 50 | %
|  | 15 | % |  | 60 | % |  | 16 | % |  | 60 | % |  | 17 | % |  | 75 | %
|  | 16 | % |  | 85 | % |  | 17 | % |  | 85 | % |  |  |  |
Maximum |  | ≥17 | % |  | 100 | % |  | ≥18 | % |  | 100 | % |  | ≥18 | % |  | 100 | %
The portion of these nonvested performance-based share awards that will be earned is as follows:
|  |  |  | Relative Total Shareholder Return vs. S&P 1500 Financial Services Index
2021 Awards |  | ≤25th percentile |  | 50th percentile "Target" |  | ≥75th percentile
Three-Year Book Value Per Share CAGR |  | 14% "Target" |  | 100% |  | 150% |  | 200%
| 12% |  | 75% |  | 125% |  | 175%
| 10% |  | 50% |  | 100% |  | 150%
| 8% |  | 25% |  | 75% |  | 125%
| 6% |  | 0% |  | 50% |  | 100%
|  |  |  | Relative Total Shareholder Return vs. S&P 1500 Financial Services Index
2022 Awards |  | ≤25th percentile |  | 50th percentile "Target" |  | ≥75th percentile
Three-Year Book Value Per Share CAGR |  | 13% "Target" |  | 100% |  | 150% |  | 200%
| 11% |  | 75% |  | 125% |  | 175%
| 9% |  | 50% |  | 100% |  | 150%
| 7% |  | 25% |  | 75% |  | 125%
| 5% |  | 0% |  | 50% |  | 100%
|  |  |  | Relative Total Shareholder Return vs. S&P 1500 Financial Services Index
2023 Awards |  | ≤25th percentile |  | 50th percentile "Target" |  | ≥75th percentile
Three-Year Book Value Per Share CAGR |  | 10% "Target" |  | 100% |  | 150% |  | 200%
| 9% |  | 75% |  | 125% |  | 175%
| 8% |  | 50% |  | 100% |  | 150%
| 6% |  | 25% |  | 75% |  | 125%
| 5% |  | 0% |  | 50% |  | 100%
Schedule of Nonvested Common Share and Nonvested Common Share unit activity | The following tables summarize nonvested common share, nonvested common share unit and DEU activity for the year ended December 31:
|  | 2023
|  | Time and Performance- Based Share Awards |  | Time-Based Share Awards |  | Share Units |  | DEUs
(Shares in thousands) |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Share Units |  | Weighted Average Grant Date Fair Value |  | Dividend Equivalent Units |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of year |  | 647 |  |  | $ | 20.99 |  |  | 138 |  |  | $ | 45.94 |  |  | 350 |  |  | $ | 45.51 |  |  | 37 |  |  | $ | 40.86 |
Granted |  | 300 |  |  | 12.66 |  |  | 75 |  |  | 43.51 |  |  | 567 |  |  | 40.81 |  |  | 37 |  |  | 40.55 |
Vested |  | (103) |  |  | 51.52 |  |  | (64) |  |  | 46.65 |  |  | (177) |  |  | 47.43 |  |  | (16) |  |  | 40.38 |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | (16) |  |  | 39.12 |  |  | (1) |  |  | 42.13 |
Outstanding at end of year |  | 844 |  |  | $ | 14.29 |  |  | 149 |  |  | $ | 44.40 |  |  | 724 |  |  | $ | 41.49 |  |  | 57 |  |  | $ | 44.00 |
|  | 2022
|  | Time and Performance- Based Share Awards |  | Time-Based Share Awards |  | Share Units |  | DEUs
(Shares in thousands) |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Share Units |  | Weighted Average Grant Date Fair Value |  | Dividend Equivalent Units |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of year |  | 500 |  |  | $ | 31.29 |  |  | 140 |  |  | $ | 45.31 |  |  | 461 |  |  | $ | 47.94 |  |  | 28 |  |  | $ | 41.75 |
Granted |  | 308 |  |  | 14.83 |  |  | 87 |  |  | 46.15 |  |  | 161 |  |  | 42.56 |  |  | 25 |  |  | 40.28 |
Vested |  | (139) |  |  | 45.32 |  |  | (86) |  |  | 45.07 |  |  | (192) |  |  | 47.53 |  |  | (14) |  |  | 41.29 |
Forfeited |  | (22) |  |  | 15.45 |  | (3) |  |  | 46.91 |  |  | (80) |  |  | 48.73 |  |  | (2) |  |  | 42.70 |
Outstanding at end of year |  | 647 |  |  | $ | 20.99 |  |  | 138 |  |  | $ | 45.94 |  |  | 350 |  |  | $ | 45.51 |  |  | 37 |  |  | $ | 40.86 |
|  | 2021
|  | Time and Performance- Based Share Awards |  | Time-Based Share Awards |  | Share Units |  | DEUs
(Shares in thousands) |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Share Units |  | Weighted Average Grant Date Fair Value |  | Dividend Equivalent Units |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of year |  | 363 |  |  | $ | 47.09 |  |  | 153 |  |  | $ | 46.34 |  |  | 492 |  |  | $ | 46.59 |  |  | 21 |  |  | $ | 37.66 |
Granted |  | 281 |  |  | 15.64 |  |  | 93 |  |  | 43.67 |  |  | 212 |  |  | 46.96 |  |  | 17 |  |  | $ | 44.86 |
Vested |  | (113) |  |  | 45.02 |  |  | (98) |  |  | 45.40 |  |  | (214) |  |  | 43.74 |  |  | (9) |  |  | 38.53 |
Forfeited |  | (31) |  |  | 24.33 |  | (8) |  |  | 44.94 |  |  | (29) |  |  | 48.85 |  |  | (1) |  |  | 40.53 |
Outstanding at end of year |  | 500 |  |  | $ | 31.29 |  |  | 140 |  |  | $ | 45.31 |  |  | 461 |  |  | $ | 47.94 |  |  | 28 |  |  | $ | 41.75 |
Schedule of Compensation Expense, Net of Forfeitures, and Related Tax Effects Recognized in Connection with Nonvested shares | Compensation expense, net of forfeitures, and related tax effects recognized in connection with nonvested shares and share units were as follows for the years ended December 31:
(In thousands) |  | 2023 |  | 2022 |  | 2021
Compensation expense |  | $ | 18,446 |  |  | $ | 18,381 |  |  | $ | 20,844 |
Income tax benefit |  | 3,660 |  |  | 3,636 |  |  | 4,088 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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