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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