Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Fixed-maturities available for sale—at fair value (amortized cost of $5,563,766 and $5,367,729)	$ 5,401,704	$ 5,517,078
Trading securities—at fair value (amortized cost of $208,912 and $234,382)	218,018	256,546
Equity securities—at fair value (cost of $182,158 and $176,229)	185,803	184,245
Short-term investments—at fair value (includes $40,856 and $48,652 of reinvested cash collateral held under securities lending agreements)	525,460	551,508
Other invested assets—at fair value	3,965	4,165
Total investments	6,334,950	6,513,542
Cash	131,853	151,145
Restricted cash	1,651	1,475
Accrued investment income	35,531	32,812
Accounts and notes receivable	142,579	124,016
Reinsurance recoverables (includes $17 and $51 for paid losses)	55,015	67,896
Deferred policy acquisition costs	16,383	16,317
Property and equipment, net	75,275	75,086
Goodwill and other acquired intangible assets, net (Note 7)	18,744	19,593
Other assets (Note 9)	803,765	837,303
Total assets	7,615,746	7,839,185
Liabilities
Unearned premiums	312,013	329,090
Reserve for losses and LAE (Note 11)	727,247	828,642
Senior notes (Note 12)	1,410,458	1,409,473
FHLB advances (Note 12)	148,983	150,983
Reinsurance funds withheld	225,363	228,078
Net deferred tax liability (Note 10)	324,004	337,509
Other liabilities	320,114	296,614
Total liabilities	3,468,182	3,580,389
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock: par value $0.001 per share; 485,000 shares authorized at March 31, 2022 and December 31, 2021; 193,642 and 194,408 shares issued at March 31, 2022 and December 31, 2021, respectively; 174,648 and 175,421 shares outstanding at March 31, 2022 and December 31, 2021, respectively	193	194
Treasury stock, at cost: 18,994 and 18,987 shares at March 31, 2022 and December 31, 2021, respectively	(920,958)	(920,798)
Additional paid-in capital	1,871,763	1,878,372
Retained earnings	3,326,119	3,180,935
Accumulated other comprehensive income (loss) (Note 15)	(129,553)	120,093
Total stockholders’ equity	4,147,564	4,258,796
Total liabilities and stockholders’ equity	$ 7,615,746	$ 7,839,185