Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	$ 4,661,761	$ 4,319,336
Equity securities	815,924	730,693
Note receivable	9,803	9,974
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	4,661,761	4,319,336
Equity securities	815,924	730,693
Short-term investments	147,865	178,491
Note receivable	9,803	9,974
Assets, fair value disclosure	5,635,353	5,238,494
Total liabilities at fair value	663	1,955
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	136,291	123,182
Equity securities	678,705	597,888
Short-term investments	146,240	176,653
Note receivable	0	0
Assets, fair value disclosure	961,236	897,723
Total liabilities at fair value	663	1,955
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	4,525,470	4,196,154
Equity securities	45,131	51,563
Short-term investments	1,625	1,838
Note receivable	9,803	9,974
Assets, fair value disclosure	4,582,029	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]
Fixed maturity securities:	0	0
Equity securities	0	0
Short-term investments	0	0
Note 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]
Fixed maturity securities:	195,579	174,450
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	136,291	123,182
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	59,288	51,268
Fair Value, Measurements, Recurring \| U.S. government bonds and agencies \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Municipal securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	2,860,186	2,777,258
Fair Value, Measurements, Recurring \| Municipal securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Municipal securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	2,860,186	2,777,258
Fair Value, Measurements, Recurring \| Municipal securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	220,341	186,887
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	220,341	186,887
Fair Value, Measurements, Recurring \| Mortgage-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Corporate securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	741,587	599,630
Fair Value, Measurements, Recurring \| Corporate securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Corporate securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	741,587	599,630
Fair Value, Measurements, Recurring \| Corporate securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Collateralized loan obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	541,199	484,947
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	541,199	484,947
Fair Value, Measurements, Recurring \| Collateralized loan obligations \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Other asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	102,869	96,164
Fair Value, Measurements, Recurring \| Other asset-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
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]
Fixed maturity securities:	102,869	96,164
Fair Value, Measurements, Recurring \| Other asset-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities:	0	0
Fair Value, Measurements, Recurring \| Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	678,705	597,888
Fair Value, Measurements, Recurring \| Common stock \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	678,705	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	45,131	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	45,131	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	92,088	81,242
Fair Value, Measurements, Recurring \| Short-term bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	11,893	13,853
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	10,268	12,015
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	1,625	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	135,928	164,595
Fair Value, Measurements, Recurring \| Money market instruments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	135,928	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	44	43
Fair Value, Measurements, Recurring \| Other \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	44	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	663	1,955
Fair Value, Measurements, Recurring \| Options sold \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	663	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