Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, at fair value:
Fixed maturity securities (amortized cost $10,908; $0)	$ 4,088,311	$ 4,031,523
Equity securities (cost $35,041; $69,371)	699,552	970,939
Short-term investments (cost $27,057; $20,441)	122,937	140,127
Total investments	4,910,800	5,142,589
Cash	289,776	335,557
Accrued investment income	52,474	43,299
Deferred income taxes	42,903	0
Other assets	49,628	27,970
Total assets	6,514,188	6,772,472
Liabilities
Notes payable	398,330	372,931
Deferred income taxes	0	53,569
Other liabilities	289,568	255,760
Total liabilities	4,992,057	4,632,191
Shareholders’ equity:
Common stock	98,947	98,943
Retained earnings	1,423,184	2,041,338
Total shareholders’ equity	1,522,131	2,140,281	$ 2,032,597
Total liabilities and shareholders’ equity	6,514,188	6,772,472
Amortized cost on fixed maturities trading investments	4,226,790	3,909,780
Cost - equity security trading investments	668,843	754,536
Cost - short-term investments	123,928	141,206
Parent Company
Investments, at fair value:
Fixed maturity securities (amortized cost $10,908; $0)	10,907	0
Equity securities (cost $35,041; $69,371)	51,416	111,399
Short-term investments (cost $27,057; $20,441)	27,059	20,441
Investment in subsidiaries	1,833,372	2,332,717
Total investments	1,922,754	2,464,557
Cash	6,218	53,738
Accrued investment income	149	16
Amounts receivable from affiliates	516	457
Current income taxes	55,777	20,738
Deferred income taxes	1,072	0
Income tax receivable from affiliates	12,865	14,202
Other assets	1,493	771
Total assets	2,000,844	2,554,479
Liabilities
Notes payable	398,330	372,931
Amounts payable to affiliates	90	0
Income tax payable to affiliates	75,079	25,626
Deferred income taxes	0	10,811
Other liabilities	5,214	4,830
Total liabilities	478,713	414,198
Shareholders’ equity:
Common stock	98,947	98,943
Retained earnings	1,423,184	2,041,338
Total shareholders’ equity	1,522,131	2,140,281
Total liabilities and shareholders’ equity	2,000,844	2,554,479
Amortized cost on fixed maturities trading investments	10,908	0
Cost - equity security trading investments	35,041	69,371
Cost - short-term investments	$ 27,057	$ 20,441