Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net earnings	$ 583,411	$ 279,354	$ 157,091
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net realized gains	(588,515)	(64,222)	(17,885)
Net unrealized (gains) losses on equity securities	121,037	(65,258)	(32,101)
Depreciation	7,981	7,394	7,432
Deferred income tax expense (benefit)	(49,639)	18,927	8,576
Other items, net	(20,467)	14,141	10,460
Change in:
Accrued investment income	(3,754)	(1,379)	(1,539)
Premiums and reinsurance balances receivable (net of direct write-offs and commutations)	(22,222)	7,349	(14,259)
Reinsurance balances payable	18,249	586	16,574
Funds held	11,371	8,026	(1,611)
Ceded unearned premiums	(7,541)	(17,428)	(19,832)
Reinsurance balances recoverable on unpaid losses and settlement expenses	(132,003)	(164,357)	(59,212)
Deferred policy acquisition costs	(24,306)	(15,128)	(3,381)
Accrued expenses	(3,405)	22,349	9,299
Unpaid losses and settlement expenses	272,082	293,506	175,697
Unearned premiums	104,641	94,058	46,173
Current income taxes payable	(6,619)	4,047	(2,665)
Changes in investment in unconsolidated investees:
Undistributed earnings	(9,853)	(37,060)	(20,233)
Dividends received	0	0	4,675
Net cash provided by operating activities	250,448	384,905	263,259
Purchase of:
Fixed income securities, available-for-sale	(2,053,359)	(733,811)	(518,362)
Equity securities	(45,007)	(140,721)	(77,863)
Property and equipment	(5,889)	(8,310)	(5,768)
Investment in equity method investee	(3,819)	(8,978)	(4,533)
Other	(5,704)	(11,428)	(12,851)
Proceeds from sale of:
Fixed income securities - available-for-sale	53,300	63,811	84,587
Equity securities	62,212	180,256	79,368
Equity method investments	686,666
Property and equipment	375
Other	2,659	7,605	4,328
Proceeds from call or maturity of:
Fixed income securities - available-for-sale	1,393,674	376,750	283,107
Net purchase of short-term investments	(36,229)
Net cash provided by (used in) investing activities	48,879	(274,826)	(167,987)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt		50,000
Proceeds from stock option exercises	(465)	1,838	8,648
Cash dividends paid	(364,848)	(135,330)	(87,906)
Net cash used in financing activities	(365,313)	(83,492)	(79,258)
Net increase (decrease) in cash	(65,986)	26,587	16,014
Cash at the beginning of the year	88,804	62,217	46,203
Cash at the end of the year	$ 22,818	$ 88,804	$ 62,217