Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investments (Notes 5 and 6)
Fixed-maturities available for sale-at fair value (amortized cost of $5,479,486 and $5,511,501)	$ 5,112,192	$ 5,074,920
Trading securities-at fair value (amortized cost of $81,520 and $89,479)	77,012	82,652
Equity securities-at fair value (cost of $118,402 and $144,579)	110,614	138,189
Residential mortgage loans held for sale-at fair value (Note 7)	279,097	519,885
Other long-term invested assets-at fair value	8,214	7,942
Short-term investments at fair value (includes $136,108 and $125,723 of reinvested cash collateral held under securities lending agreements)	526,663	521,648
Total investments	6,113,792	6,345,236
Cash	24,182	38,823
Restricted cash	4,168	2,649
Accrued investment income	44,378	49,053
Accounts and notes receivable	127,741	128,093
Reinsurance recoverables (includes $528 and $444 for paid losses)	40,227	36,433
Deferred policy acquisition costs	17,855	17,746
Property and equipment, net	25,576	27,637
Prepaid federal income taxes (Note 10)	921,080	921,080
Other assets (Note 9)	381,846	375,931
Securitized residential mortgage loans held for investment at fair value	1,058,736	717,227
Other VIE assets	5,805	4,080
Total assets	8,765,386	8,663,988
Liabilities
Reserve for losses and LAE (Note 11)	374,945	360,326
Unearned premiums	178,931	188,337
Senior notes (Note 12)	1,065,965	1,065,337
Secured borrowings (Note 12)	272,667	538,294
Net deferred tax liability	804,149	746,685
Other liabilities (Note 9)	442,188	431,556
Securitized nonrecourse debt-at fair value	1,029,008	703,526
Other VIE liabilities	10,707	6,069
Total liabilities	4,178,560	4,040,130
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2025: 162,038 and 141,220 shares issued and outstanding, respectively; 2024: 168,350 and 147,569 shares issued and outstanding, respectively)	162	168
Treasury stock, at cost (2025: 20,818 shares; 2024: 20,782 shares)	(969,396)	(968,246)
Additional paid-in capital	1,048,738	1,246,826
Retained earnings	4,802,038	4,695,348
Accumulated other comprehensive income (loss) (Note 15)	(294,716)	(350,238)
Total stockholders’ equity	4,586,826	4,623,858
Total liabilities and stockholders’ equity	$ 8,765,386	$ 8,663,988