Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments (Notes 5 and 6)
Fixed-maturities available for sale-at fair value (amortized cost of $5,449,992 and $5,511,501)	$ 5,108,278	$ 5,074,920
Trading securities-at fair value (amortized cost of $78,791 and $89,479)	74,317	82,652
Equity securities-at fair value (cost of $97,231 and $144,579)	92,991	138,189
Residential mortgage loans held for sale-at fair value (Note 7)	698,367	519,885
Other long-term invested assets-at fair value	8,238	7,942
Short-term investments at fair value (includes $164,529 and $125,723 of reinvested cash collateral held under securities lending agreements)	502,501	521,648
Total investments	6,484,692	6,345,236
Cash	22,090	38,823
Restricted cash	105	2,649
Accrued investment income	50,542	49,053
Accounts and notes receivable	130,020	128,093
Reinsurance recoverables (includes $831 and $444 for paid losses)	43,652	36,433
Deferred policy acquisition costs	17,248	17,746
Property and equipment, net	23,516	27,637
Prepaid federal income taxes (Note 10)	997,805	921,080
Other assets (Note 9)	408,675	375,931
Securitized residential mortgage loans held for investment at fair value	1,394,700	717,227
Other VIE assets	7,612	4,080
Total assets	9,580,657	8,663,988
Liabilities
Reserve for losses and LAE (Note 11)	383,103	360,326
Unearned premiums	171,901	188,337
Senior notes (Note 12)	1,066,603	1,065,337
Secured borrowings (Note 12)	762,933	538,294
Net deferred tax liability	841,376	746,685
Other liabilities (Note 9)	490,165	431,556
Securitized nonrecourse debt-at fair value	1,360,195	703,526
Other VIE liabilities	11,700	6,069
Total liabilities	5,087,976	4,040,130
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2025: 156,781 and 135,395 shares issued and outstanding, respectively; 2024: 168,350 and 147,569 shares issued and outstanding, respectively)	157	168
Treasury stock, at cost (2025: 21,387 shares; 2024: 20,782 shares)	(988,764)	(968,246)
Additional paid-in capital	847,399	1,246,826
Retained earnings	4,906,830	4,695,348
Accumulated other comprehensive income (loss) (Note 15)	(272,941)	(350,238)
Total stockholders’ equity	4,492,681	4,623,858
Total liabilities and stockholders’ equity	$ 9,580,657	$ 8,663,988