Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investments (Notes 5 and 6)
Fixed-maturities available for sale-at fair value (amortized cost of $5,583,574 and $5,599,111)	$ 5,292,480	$ 5,188,228
Trading securities-at fair value (amortized cost of $91,976 and $110,484)	89,272	106,423
Equity securities-at fair value (cost of $151,307 and $92,124)	145,717	89,057
Residential mortgage loans held for sale-at fair value (Note 7)	529,517	32,755
Other invested assets—at fair value	7,809	8,625
Short-term investments at fair value (includes $116,905 and $149,364 of reinvested cash collateral held under securities lending agreements)	432,385	660,566
Total investments	6,497,180	6,085,654
Cash	28,061	18,999
Restricted cash	2,014	1,066
Accrued investment income	49,707	45,783
Accounts and notes receivable	138,439	123,857
Reinsurance recoverables (includes $369 and $59 for paid losses)	34,015	25,909
Deferred policy acquisition costs	18,430	18,718
Property and equipment, net	41,892	63,822
Prepaid federal income taxes (Note 10)	870,336	750,320
Other assets (Note 9)	384,666	459,805
Securitized residential mortgage loans held for investment at fair value	353,078
Other VIE assets	1,953
Total assets	8,419,771	7,593,933
Liabilities
Unearned premiums	198,007	225,396
Reserve for losses and LAE (Note 11)	363,225	370,148
Senior notes (Note 12)	1,064,718	1,417,781
Secured borrowings (Note 12)	551,916	119,476
Reinsurance funds withheld	138,810	130,564
Net deferred tax liability	737,605	589,564
Other liabilities	318,345	343,199
Securitized nonrecourse debt-at fair value	344,904
Other VIE liabilities	3,388
Total liabilities	3,720,918	3,196,128
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2024: 170,541 and 149,776 shares issued and outstanding, respectively; 2023: 173,247 and 153,179 shares issued and outstanding, respectively)	171	173
Treasury stock, at cost (2024: 20,766 shares; 2023: 20,068 shares)	(967,717)	(945,870)
Additional paid-in capital	1,315,046	1,430,594
Retained earnings	4,584,453	4,243,759
Accumulated other comprehensive income (loss) (Note 15)	(233,100)	(330,851)
Total stockholders’ equity	4,698,853	4,397,805
Total liabilities and stockholders’ equity	$ 8,419,771	$ 7,593,933