Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Fixed-maturities available for sale—at fair value (amortized cost of $5,643,884 and $5,367,729)	$ 5,228,744	$ 5,517,078
Trading securities—at fair value (amortized cost of $188,570 and $234,382)	189,441	256,546
Equity securities—at fair value (cost of $156,648 and $176,229)	146,574	184,245
Short-term investments—at fair value (includes $67,107 and $48,652 of reinvested cash collateral held under securities lending agreements)	336,306	551,508
Other invested assets—at fair value	5,082	4,165
Total investments	5,906,147	6,513,542
Cash	135,262	151,145
Restricted cash	561	1,475
Accrued investment income	35,774	32,812
Accounts and notes receivable	166,380	124,016
Reinsurance recoverables (includes $17 and $51 for paid losses)	39,876	67,896
Deferred policy acquisition costs	16,983	16,317
Property and equipment, net	74,874	75,086
Goodwill and other acquired intangible assets, net (Note 7)	17,895	19,593
Prepaid federal income taxes (Note 10)	466,123	354,123
Other assets (Note 9)	414,412	483,180
Total assets	7,274,287	7,839,185
Liabilities
Unearned premiums	298,991	329,090
Reserve for losses and LAE (Note 11)	594,808	828,642
Senior notes (Note 12)	1,411,458	1,409,473
FHLB advances (Note 12)	184,284	150,983
Reinsurance funds withheld	223,649	228,078
Net deferred tax liability (Note 10)	324,866	337,509
Other liabilities	305,269	296,614
Total liabilities	3,343,325	3,580,389
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at June 30, 2022, and December 31, 2021; 185,822 and 194,408 shares issued at June 30, 2022, and December 31, 2021, respectively; 166,388 and 175,421 shares outstanding at June 30, 2022, and December 31, 2021, respectively	186	194
Treasury stock, at cost: 19,434 and 18,987 shares at June 30, 2022, and December 31, 2021, respectively	(930,284)	(920,798)
Additional paid-in capital	1,698,490	1,878,372
Retained earnings	3,491,675	3,180,935
Accumulated other comprehensive income (loss) (Note 15)	(329,105)	120,093
Total stockholders’ equity	3,930,962	4,258,796
Total liabilities and stockholders’ equity	$ 7,274,287	$ 7,839,185