Fair Value Measurement - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	$ 4,913,378	$ 4,319,336
Total equity securities	879,175	730,693
Notes receivable	31,231	9,974
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	4,913,378	4,319,336
Total equity securities	879,175	730,693
Total short-term investments	283,817	178,491
Notes receivable	31,231	9,974
Total assets at fair value	6,107,601	5,238,494
Total liabilities at fair value	213	1,955
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	75,874	123,182
Total equity securities	741,369	597,888
Total short-term investments	282,162	176,653
Notes receivable	0	0
Total assets at fair value	1,099,405	897,723
Total liabilities at fair value	213	1,955
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fixed maturity securities	4,837,504	4,196,154
Total equity securities	42,603	51,563
Total short-term investments	1,655	1,838
Notes receivable	31,231	9,974
Total assets at fair value	4,912,993	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
Total equity securities	0	0
Total short-term investments	0	0
Notes receivable	0	0
Total assets at fair value	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	93,837	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	75,874	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	17,963	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	2,987,054	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	2,987,054	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	259,421	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	259,421	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	841,715	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	841,715	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	626,255	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	626,255	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	105,096	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	105,096	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]
Total equity securities	741,369	597,888
Fair Value, Measurements, Recurring \| Common stock \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	741,369	597,888
Fair Value, Measurements, Recurring \| Common stock \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	0	0
Fair Value, Measurements, Recurring \| Common stock \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	0	0
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	42,603	51,563
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	0	0
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total equity securities	42,603	51,563
Fair Value, Measurements, Recurring \| Non-redeemable preferred stock \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total 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]
Total equity securities	95,203	81,242
Fair Value, Measurements, Recurring \| Short-term bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	1,655	13,853
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	12,015
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	1,655	1,838
Fair Value, Measurements, Recurring \| Short-term bonds \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	0
Fair Value, Measurements, Recurring \| Money market instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	282,141	164,595
Fair Value, Measurements, Recurring \| Money market instruments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	282,141	164,595
Fair Value, Measurements, Recurring \| Money market instruments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	0
Fair Value, Measurements, Recurring \| Money market instruments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	0
Fair Value, Measurements, Recurring \| Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	21	43
Fair Value, Measurements, Recurring \| Other \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	21	43
Fair Value, Measurements, Recurring \| Other \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	0
Fair Value, Measurements, Recurring \| Other \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total short-term investments	0	0
Fair Value, Measurements, Recurring \| Options sold
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	213	1,955
Fair Value, Measurements, Recurring \| Options sold \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options sold	213	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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Balance Type:	debit
Period Type:	instant