Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Fixed-maturities available for sale—at fair value (amortized cost of $5,535,532 and $5,367,729)	$ 4,909,232	$ 5,517,078
Trading securities—at fair value (amortized cost of $146,446 and $234,382)	139,901	256,546
Equity securities—at fair value (cost of $162,320 and $176,229)	145,155	184,245
Short-term investments—at fair value (includes $85,777 and $48,652 of reinvested cash collateral held under securities lending agreements)	392,514	551,508
Other invested assets—at fair value	5,079	4,165
Total investments	5,591,881	6,513,542
Cash	54,701	151,145
Restricted cash	1,107	1,475
Accrued investment income	38,596	32,812
Accounts and notes receivable	174,041	124,016
Reinsurance recoverables (includes $12 and $51 for paid losses)	30,569	67,896
Deferred policy acquisition costs	17,920	16,317
Property and equipment, net	75,740	75,086
Goodwill and other acquired intangible assets, net (Note 7)	16,873	19,593
Prepaid federal income taxes (Note 10)	526,123	354,123
Other assets (Note 9)	458,292	483,180
Total assets	6,985,843	7,839,185
Liabilities
Unearned premiums	285,290	329,090
Reserve for losses and LAE (Note 11)	483,664	828,642
Senior notes (Note 12)	1,412,473	1,409,473
FHLB advances (Note 12)	153,550	150,983
Reinsurance funds withheld	218,777	228,078
Net deferred tax liability (Note 10)	335,374	337,509
Other liabilities	358,665	296,614
Total liabilities	3,247,793	3,580,389
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2022: 176,497 and 157,058 shares issued and outstanding, respectively; 2021: 194,408 and 175,421 shares issued and outstanding, respectively)	176	194
Treasury stock, at cost (2022: 19,440 shares; 2021: 18,987 shares)	(930,396)	(920,798)
Additional paid-in capital	1,513,615	1,878,372
Retained earnings	3,656,870	3,180,935
Accumulated other comprehensive income (loss) (Note 15)	(502,215)	120,093
Total stockholders’ equity	3,738,050	4,258,796
Total liabilities and stockholders’ equity	$ 6,985,843	$ 7,839,185