Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments (Notes 5 and 6)
Fixed-maturities available for sale—at fair value (amortized cost of $5,648,303 and $5,599,111)	$ 5,176,521	$ 5,188,228
Trading securities—at fair value (amortized cost of $99,005 and $110,484)	91,928	106,423
Equity securities—at fair value (cost of $149,266 and $92,124)	143,314	89,057
Mortgage loans held for sale—at fair value (Note 7)	458,096	32,755
Other invested assets—at fair value	7,422	8,625
Short-term investments—at fair value (includes $98,397 and $149,364 of reinvested cash collateral held under securities lending agreements)	710,868	660,566
Total investments	6,588,149	6,085,654
Cash	13,791	18,999
Restricted cash	1,993	1,066
Accrued investment income	47,607	45,783
Accounts and notes receivable	137,777	123,857
Reinsurance recoverables (includes $174 and $59 for paid losses)	31,064	25,909
Deferred policy acquisition costs	18,566	18,718
Property and equipment, net	56,360	63,822
Prepaid federal income taxes (Note 10)	837,736	750,320
Other assets (Note 9)	396,600	459,805
Total assets	8,129,643	7,593,933
Liabilities
Unearned premiums	206,094	225,396
Reserve for losses and LAE (Note 11)	357,470	370,148
Senior notes (Note 12)	1,513,782	1,417,781
Secured borrowings (Note 12)	484,665	119,476
Reinsurance funds withheld	135,849	130,564
Net deferred tax liability	656,113	589,564
Other liabilities	293,351	343,199
Total liabilities	3,647,324	3,196,128
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2024: 171,898 and 151,148 shares issued and outstanding, respectively; 2023: 173,247 and 153,179 shares issued and outstanding, respectively)	172	173
Treasury stock, at cost (2024: 20,750 shares; 2023: 20,068 shares)	(967,218)	(945,870)
Additional paid-in capital	1,356,341	1,430,594
Retained earnings	4,470,335	4,243,759
Accumulated other comprehensive income (loss) (Note 15)	(377,311)	(330,851)
Total stockholders’ equity	4,482,319	4,397,805
Total liabilities and stockholders’ equity	$ 8,129,643	$ 7,593,933