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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock, At Cost | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2023 |  | 80,881,000 |  |  |  |
Beginning balance at Dec. 31, 2023 | $ 1,926,004 | $ 873 | $ 990,816 | $ (148,921) | $ (139,917) | $ 1,223,153
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes (in shares) |  | 505,000 |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (5,579) | $ 5 | (5,584) |  |  |
Repurchase of common stock (in shares) |  | (840,000) |  |  |  |
Repurchase of common stock | (25,306) |  |  | (25,306) |  |
Share-based compensation expense | 4,117 |  | 4,117 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | (9,905) |  |  |  | (9,905) |
Net income | 89,050 |  |  |  |  | 89,050
Ending balance (in shares) at Mar. 31, 2024 |  | 80,546,000 |  |  |  |
Ending balance at Mar. 31, 2024 | 1,978,381 | $ 878 | 989,349 | (174,227) | (149,822) | 1,312,203
Beginning balance (in shares) at Dec. 31, 2023 |  | 80,881,000 |  |  |  |
Beginning balance at Dec. 31, 2023 | 1,926,004 | $ 873 | 990,816 | (148,921) | (139,917) | 1,223,153
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 273,939 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2024 |  | 79,321,000 |  |  |  |
Ending balance at Sep. 30, 2024 | 2,195,186 | $ 879 | 997,570 | (218,364) | (81,991) | 1,497,092
Beginning balance (in shares) at Mar. 31, 2024 |  | 80,546,000 |  |  |  |
Beginning balance at Mar. 31, 2024 | 1,978,381 | $ 878 | 989,349 | (174,227) | (149,822) | 1,312,203
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes (in shares) |  | 62,000 |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (319) | $ 1 | (320) |  |  |
Repurchase of common stock (in shares) |  | (844,000) |  |  |  |
Repurchase of common stock | (27,096) |  |  | (27,096) |  |
Share-based compensation expense | 4,114 |  | 4,114 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | (1,549) |  |  |  | (1,549) |
Net income | 92,079 |  |  |  |  | 92,079
Ending balance (in shares) at Jun. 30, 2024 |  | 79,764,000 |  |  |  |
Ending balance at Jun. 30, 2024 | 2,045,610 | $ 879 | 993,143 | (201,323) | (151,371) | 1,404,282
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (12) |  | (12) |  |  |
Repurchase of common stock (in shares) |  | (443,000) |  |  |  |
Repurchase of common stock | (17,041) |  |  | (17,041) |  |
Share-based compensation expense | 4,439 |  | 4,439 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | 69,380 |  |  |  | 69,380 |
Net income | 92,810 |  |  |  |  | 92,810
Ending balance (in shares) at Sep. 30, 2024 |  | 79,321,000 |  |  |  |
Ending balance at Sep. 30, 2024 | $ 2,195,186 | $ 879 | 997,570 | (218,364) | (81,991) | 1,497,092
Beginning balance (in shares) at Dec. 31, 2024 | 78,600,726 | 78,601,000 |  |  |  |
Beginning balance at Dec. 31, 2024 | $ 2,217,432 | $ 879 | 1,004,692 | (246,594) | (124,804) | 1,583,259
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes (in shares) |  | 418,000 |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (7,650) | $ 4 | (7,654) |  |  |
Repurchase of common stock (in shares) |  | (718,000) |  |  |  |
Repurchase of common stock | (26,053) |  |  | (26,053) |  |
Share-based compensation expense | 4,507 |  | 4,507 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | 30,776 |  |  |  | 30,776 |
Net income | 102,559 |  |  |  |  | 102,559
Ending balance (in shares) at Mar. 31, 2025 |  | 78,301,000 |  |  |  |
Ending balance at Mar. 31, 2025 | $ 2,321,571 | $ 883 | 1,001,545 | (272,647) | (94,028) | 1,685,818
Beginning balance (in shares) at Dec. 31, 2024 | 78,600,726 | 78,601,000 |  |  |  |
Beginning balance at Dec. 31, 2024 | $ 2,217,432 | $ 879 | 1,004,692 | (246,594) | (124,804) | 1,583,259
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | $ 294,709 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2025 | 77,095,871 | 77,095,000 |  |  |  |
Ending balance at Sep. 30, 2025 | $ 2,514,871 | $ 884 | 1,010,550 | (320,877) | (53,654) | 1,877,968
Beginning balance (in shares) at Mar. 31, 2025 |  | 78,301,000 |  |  |  |
Beginning balance at Mar. 31, 2025 | 2,321,571 | $ 883 | 1,001,545 | (272,647) | (94,028) | 1,685,818
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes (in shares) |  | 44,000 |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (443) | $ 1 | (444) |  |  |
Repurchase of common stock (in shares) |  | (628,000) |  |  |  |
Repurchase of common stock | (23,400) |  |  | (23,400) |  |
Share-based compensation expense | 4,957 |  | 4,957 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | 21,271 |  |  |  | 21,271 |
Net income | 96,151 |  |  |  |  | 96,151
Ending balance (in shares) at Jun. 30, 2025 |  | 77,717,000 |  |  |  |
Ending balance at Jun. 30, 2025 | 2,420,107 | $ 884 | 1,006,058 | (296,047) | (72,757) | 1,781,969
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes (in shares) |  | 6,000 |  |  |  |
Common stock: shares issued under stock plans, net of shares withheld for employee taxes | (12) |  | (12) |  |  |
Repurchase of common stock (in shares) |  | (628,000) |  |  |  |
Repurchase of common stock | (24,830) |  |  | (24,830) |  |
Share-based compensation expense | 4,504 |  | 4,504 |  |  |
Change in unrealized investment gains/losses, net of tax expense (benefit) | 19,103 |  |  |  | 19,103 |
Net income | $ 95,999 |  |  |  |  | 95,999
Ending balance (in shares) at Sep. 30, 2025 | 77,095,871 | 77,095,000 |  |  |  |
Ending balance at Sep. 30, 2025 | $ 2,514,871 | $ 884 | $ 1,010,550 | $ (320,877) | $ (53,654) | $ 1,877,968

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