Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net earnings	$ 403,337	$ 345,779	$ 304,611
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net realized gains	(65,116)	(19,966)	(32,518)
Net unrealized gains on equity securities	(43,247)	(81,734)	(64,787)
Depreciation	8,129	7,664	8,545
Deferred income tax expense	12,627	10,052	7,710
Other items, net	15,552	13,725	24,947
Change in:
Accrued investment income	(1,707)	(4,257)	(2,803)
Premiums and reinsurance balances receivable (net of direct write-offs)	18,308	(9,328)	(31,705)
Reinsurance balances payable	(4,101)	(26,826)	10,407
Funds held	29,862	(4,066)	302
Ceded unearned premiums	286	(12,698)	26,200
Reinsurance balances recoverable on unpaid losses and settlement expenses	8,627	1,924	(17,260)
Deferred policy acquisition costs	(6,434)	(19,648)	(18,707)
Accrued expenses	4,355	15,362	14,011
Unpaid losses and settlement expenses	193,349	247,445	130,388
Unearned premiums	7,496	91,814	107,241
Current income taxes payable	28,974	(3,008)	7,285
Changes in investment in unconsolidated investees:
Undistributed earnings	3,924	4,869	(9,610)
Dividends received		3,116
Net cash provided by operating activities	614,221	560,219	464,257
Purchase of:
Fixed income securities, available-for-sale	(1,278,007)	(811,926)	(662,070)
Equity securities	(171,520)	(97,922)	(55,652)
Property and equipment	(5,523)	(4,710)	(5,913)
Other	(4,721)	(10,956)	(10,786)
Proceeds from sale of:
Fixed income securities, available-for-sale	561,397	149,939	50,135
Equity securities	115,731	64,839	51,881
Equity method investee	2,611		14,284
Property and equipment		13	27
Other	6,044	5,548	817
Proceeds from call or maturity of:
Fixed income, available-for-sale	457,507	326,297	504,168
Net sale (purchase) of short-term investments	(45,647)	60,008	(98,694)
Net cash used in investing activities	(362,128)	(318,870)	(211,803)
Cash Flows from Financing Activities
Proceeds from issuance of debt	50,000	73,000	100,000
Repayment of debt	(50,000)	(73,000)	(200,000)
Proceeds from stock option exercises	1,244	(2,327)	1,245
Cash dividends paid	(241,562)	(235,656)	(140,093)
Net cash used in financing activities	(240,318)	(237,983)	(238,848)
Net increase (decrease) in cash	11,775	3,366	13,606
Cash at beginning of year	39,790	36,424	22,818
Cash at end of year	$ 51,565	$ 39,790	$ 36,424