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SHARE-BASED COMPENSATION | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
SHARE-BASED COMPENSATION | SHARE-BASED COMPENSATION Performance Restricted Stock Units Performance Restricted Stock Units granted in 2025 with a market condition Certain share-settled performance restricted stock units granted in 2025 include a market condition which is the Company’s total shareholder return relative to its peer group ("Relative TSR") over the performance period. Relative TSR is calculated in accordance with the terms of the applicable award agreement. If performance goals are achieved, these awards will cliff vest at the end of a three-year performance period within a range of 0% to 200% of target. Performance Restricted Stock Units granted in 2025 with a performance condition Certain share-settled performance restricted stock units granted in 2025 include a performance condition which is the Company’s average annual growth in book value per diluted common share, plus accumulated dividends over the performance period, adjusted to exclude unrealized investment gains (losses) recognized in accumulated other comprehensive income (loss), and share repurchases during the performance period ("Adjusted DBVPS"). Adjusted DBVPS is calculated in accordance with the terms of the applicable award agreement. If performance goals are achieved, these awards will cliff vest at the end of a three-year performance period within a range of 0% to 200% of target. Valuation assumptions Performance Restricted Stock Units granted in 2025 and 2024 with a market condition The fair value of these performance restricted stock units was measured on the grant date using a Monte Carlo simulation model. The following table provides details of the significant inputs used in the Monte Carlo simulation model:
| Three months ended March 31, | 2025 | 2024 |  |  |  |  |
| Expected volatility | 25.30% | 26.00% |  |  |  |  |
| Expected term (in years) | 3.0 | 3.0 |  |  |  |  |
| Expected dividend yield | n/a | n/a |  |  |  |  |
| Risk-free interest rate | 4.16% | 4.06% |  |  |  |  |
n/a - not applicable Beginning share price: The beginning share price for awards was based on the average closing share price over the 30 trading days preceding and including the start of the performance period. Ending share price: The ending share price was based on the average projected closing share price over the 30 trading days preceding and including the end of the performance period. Expected term: Performance for awards granted in 2025 is measured from January 1, 2025 to December 31, 2027, and performance for awards granted in 2024 is measured from January 1, 2024 to December 31, 2026. Expected volatility: The expected volatility is estimated based on the Company's historical share price volatility. Expected dividend yield: The expected dividend yield is not applicable to the performance restricted stock units as dividends are paid at the end of the vesting period and do not affect the value of the performance restricted stock units. Risk-free interest rate: The risk-free rate is estimated based on the yield on a U.S. treasury zero-coupon bond issued with a remaining term equal to the vesting period of the performance restricted stock units. Compensation expense associated with performance restricted stock units granted in 2025 and 2024 is determined on the grant date based on the fair value calculated by the Monte Carlo simulation model, and is recognized on a straight-line basis over the requisite service period. Performance Restricted Stock Units granted in 2025 and 2024 with a performance condition The fair value of these performance restricted stock units was determined based on the closing price of the Company's common shares on the grant date. Compensation expense is recognized on a straight-line basis over the requisite service period and is subject to periodic adjustment based on the achievement of established performance criteria during the performance period. The following table provides an activity summary of the Company's share-settled restricted stock units for the three months ended March 31, 2025:
|  | Share-Settled Performance Restricted Stock Units |  | Share-Settled Service Restricted Stock Units |
|  | Number of restricted stock units |  | Weighted average grant date fair value |  | Number of restricted stock units |  | Weighted average grant date fair value |
| Non-vested restricted stock units - beginning of period | 247 |  |  | $ | 65.73 |  |  | 1,642 |  |  | $ | 57.73 |  |
| Granted | 89 |  |  | 98.22 |  |  | 577 |  |  | 90.42 |  |
| Performance adjustment (1) | 55 |  |  | 68.63 |  |  | — |  |  | — |  |
| Vested | (115) |  |  | 68.63 |  |  | (599) |  |  | 56.73 |  |
| Forfeited | — |  |  | — |  |  | (25) |  |  | 61.10 |  |
| Non-vested restricted stock units - end of period | 276 |  |  | $ | 75.61 |  |  | 1,595 |  |  | $ | 69.90 |  |
(1) The performance adjustment represents the difference between the number of performance restricted stock units granted and earned, that vested following the three-year performance period that ended in 2024. The performance restricted stock units were granted at the target level of achievement. The following table provides additional information related to share-based compensation:
| Three months ended March 31, | 2025 |  | 2024 |
| Share-based compensation expense | $ | 11,829 |  |  | $ | 13,671 |  |
| Tax benefits associated with share-based compensation expense | $ | 5,351 |  |  | $ | 2,763 |  |
| Fair value of restricted stock units vested(1) | $ | 68,889 |  |  | $ | 41,156 |  |
| Unrecognized share-based compensation expense | $ | 107,782 |  |  | $ | 92,556 |  |
| Expected weighted average period associated with the recognition of unrecognized share-based compensation expense | 2.9 years |  | 2.9 years |
(1) Fair value is based on the closing price of the Company's common shares on the vest date.

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