Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets
Fixed-maturities available for sale—at fair value (amortized cost of $5,655,280 and $5,587,261)	$ 5,172,375	$ 5,017,711
Trading securities—at fair value (amortized cost of $112,636 and $122,472)	108,306	115,665
Equity securities—at fair value (cost of $165,165 and $162,899)	155,870	148,965
Mortgage loans held for sale—at fair value	18,843	3,549
Other invested assets—at fair value	5,746	5,511
Short-term investments—at fair value (includes $86,077 and $99,735 of reinvested cash collateral held under securities lending agreements)	376,752	402,090
Total investments	5,837,892	5,693,491
Cash	50,167	56,183
Restricted cash	577	377
Accrued investment income	42,567	40,093
Accounts and notes receivable	129,565	119,834
Reinsurance recoverables (includes $21 and $18 for paid losses)	24,396	25,633
Deferred policy acquisition costs	18,236	18,460
Property and equipment, net	72,111	70,981
Goodwill and other acquired intangible assets, net (Note 7)	13,914	15,285
Prepaid federal income taxes (Note 10)	596,368	596,368
Other assets (Note 9)	418,609	427,024
Total assets	7,204,402	7,063,729
Liabilities
Unearned premiums	257,735	271,479
Reserve for losses and LAE (Note 11)	405,651	426,843
Senior notes (Note 12)	1,414,549	1,413,504
Other borrowings (Note 12)	121,642	155,822
Reinsurance funds withheld	153,099	152,067
Net deferred tax liability	455,517	391,083
Other liabilities	289,731	333,604
Total liabilities	3,097,924	3,144,402
Commitments and contingencies (Note 13)
Stockholders’ equity
Common stock ($0.001 par value; 485,000 shares authorized; 2023: 176,032 and 156,547 shares issued and outstanding, respectively; 2022: 176,509 and 157,056 shares issued and outstanding, respectively)	176	176
Treasury stock, at cost (2023: 19,485 shares; 2022: 19,453 shares)	(931,313)	(930,643)
Additional paid-in capital	1,515,852	1,519,641
Retained earnings	3,908,396	3,786,952
Accumulated other comprehensive income (loss) (Note 15)	(386,633)	(456,799)
Total stockholders’ equity	4,106,478	3,919,327
Total liabilities and stockholders’ equity	$ 7,204,402	$ 7,063,729