Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	$ 4,858,840	$ 4,319,336
Equity securities	870,837	730,693
Notes receivable	31,948	9,974
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	4,858,840	4,319,336
Equity securities	870,837	730,693
Short-term investments	288,704	178,491
Notes receivable	31,948	9,974
Assets, fair value disclosure	6,050,329	5,238,494
Total liabilities at fair value	620	1,955
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	80,523	123,182
Equity securities	734,198	597,888
Short-term investments	287,058	176,653
Notes receivable	0	0
Assets, fair value disclosure	1,101,779	897,723
Total liabilities at fair value	620	1,955
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	4,778,317	4,196,154
Equity securities	47,389	51,563
Short-term investments	1,646	1,838
Notes receivable	31,948	9,974
Assets, fair value disclosure	4,859,300	4,259,529
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Equity securities	0	0
Short-term investments	0	0
Notes receivable	0	0
Assets, fair value disclosure	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	120,565	174,450
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	80,523	123,182
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	40,042	51,268
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	3,027,149	2,777,258
Fair Value, Measurements, Recurring \| Municipal securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Municipal securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	3,027,149	2,777,258
Fair Value, Measurements, Recurring \| Municipal securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	244,866	186,887
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	244,866	186,887
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Corporate securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	769,051	599,630
Fair Value, Measurements, Recurring \| Corporate securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Corporate securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	769,051	599,630
Fair Value, Measurements, Recurring \| Corporate securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Collateralized loan obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	592,295	484,947
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	592,295	484,947
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Other asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	104,914	96,164
Fair Value, Measurements, Recurring \| Other asset-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Other asset-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	104,914	96,164
Fair Value, Measurements, Recurring \| Other asset-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	0	0
Fair Value, Measurements, Recurring \| Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	734,198	597,888
Fair Value, Measurements, Recurring \| Common stock \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	734,198	597,888
Fair Value, Measurements, Recurring \| Common stock \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring \| Common stock \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	47,389	51,563
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	47,389	51,563
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Fair Value, Measurements, Recurring \| Private equity funds measured at net asset value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	89,250	81,242
Fair Value, Measurements, Recurring \| Short-term bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	8,890	13,853
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	7,244	12,015
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	1,646	1,838
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring \| Money market instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	279,783	164,595
Fair Value, Measurements, Recurring \| Money market instruments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	279,783	164,595
Fair Value, Measurements, Recurring \| Money market instruments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring \| Money market instruments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring \| Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	31	43
Fair Value, Measurements, Recurring \| Other \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	31	43
Fair Value, Measurements, Recurring \| Other \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring \| Other \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring \| Options sold
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	620	1,955
Fair Value, Measurements, Recurring \| Options sold \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	620	1,955
Fair Value, Measurements, Recurring \| Options sold \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	0	0
Fair Value, Measurements, Recurring \| Options sold \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Period Type:	instant