Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2023

Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques

The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values:

	December 31, 2023
	Level 1		Level 2		Level 3		Total
	(Amounts in thousands)
Assets
Fixed maturity securities:
U.S. government bonds and agencies	$	123,182	$	51,268	$	—	$	174,450
Municipal securities	—		2,777,258		—		2,777,258
Mortgage-backed securities	—		186,887		—		186,887
Corporate securities	—		599,630		—		599,630
Collateralized loan obligations	—		484,947		—		484,947
Other asset-backed securities	—		96,164		—		96,164
Total fixed maturity securities	123,182		4,196,154		—		4,319,336
Equity securities:
Common stock	597,888		—		—		597,888
Non-redeemable preferred stock	—		51,563		—		51,563
Private equity funds measured at net asset value (1)							81,242
Total equity securities	597,888		51,563		—		730,693
Short-term investments:
Short-term bonds	12,015		1,838		—		13,853
Money market instruments	164,595		—		—		164,595
Other	43		—		—		43
Total short-term investments	176,653		1,838		—		178,491
Other assets:
Note receivable	—		9,974		—		9,974
Total assets at fair value	$	897,723	$	4,259,529	$	—	$	5,238,494
Liabilities
Other liabilities:
Options sold	1,955		—		—		1,955
Total liabilities at fair value	$	1,955	$	—	$	—	$	1,955

	December 31, 2022
	Level 1		Level 2		Level 3		Total
	(Amounts in thousands)
Assets
Fixed maturity securities:
U.S. government bonds	$	103,519	$	55,088	$	—	$	158,607
Municipal securities	—		2,737,183		—		2,737,183
Mortgage-backed securities	—		166,260		—		166,260
Corporate securities	—		569,553		—		569,553
Collateralized debt obligations	—		320,252		—		320,252
Other asset-backed securities	—		136,456		—		136,456
Total fixed maturity securities	103,519		3,984,792		—		4,088,311
Equity securities:
Common stock	558,169		—		—		558,169
Non-redeemable preferred stock	—		51,236		—		51,236
Private equity funds measured at net asset value (1)							90,147
Total equity securities	558,169		51,236		—		699,552
Short-term investments:
Short-term bonds	51,638		8,238		—		59,876
Money market instruments	63,021		—		—		63,021
Other	40		—		—		40
Total short-term investments	114,699		8,238		—		122,937
Total assets at fair value	$	776,387	$	4,044,266	$	—	$	4,910,800
Liabilities
Other liabilities:
Options sold	162		—		—		162
Total liabilities at fair value	$	162	$	—	$	—	$	162

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(1) The fair value is measured using the NAV practical expedient; therefore, it is not categorized within the fair value hierarchy. The fair value amount is presented in this table to permit reconciliation of the fair value hierarchy to the amounts presented in the Company's consolidated balance sheets.

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following tables present the carrying value and fair value of the Company’s financial instruments disclosed, but not carried, at fair value, and the level within the fair value hierarchy at which such instruments are categorized:

	December 31, 2023
	Carrying Value		Fair Value		Level 1		Level 2		Level 3
	(Amounts in thousands)
Liabilities
Notes payable:
Unsecured notes	$	373,729	$	357,765	$	—	$	357,765	$	—
Unsecured credit facility	200,000		199,945		—		199,945		—
Total	$	573,729	$	557,710	$	—	$	557,710	$	—

	December 31, 2022
	Carrying Value		Fair Value		Level 1		Level 2		Level 3
	(Amounts in thousands)
Liabilities
Notes payable:
Unsecured notes	$	373,330	$	350,644	$	—	$	350,644	$	—
Unsecured credit facility	25,000		24,987		—		24,987		—
Total	$	398,330	$	375,631	$	—	$	375,631	$	—