Notes Payable (Schedule of Long-term Debt) (Details)		9 Months Ended	11 Months Ended	12 Months Ended
	Nov. 18, 2022 USD ($)	Sep. 30, 2023 USD ($)	Oct. 26, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 08, 2017 USD ($)
Debt Instrument [Line Items]
Interest rate						4.40%
Total principal amount		$ 575,000,000		$ 400,000,000
Less unamortized discount and debt issuance costs		1,371,000		1,670,000
Notes payable		573,629,000		398,330,000
Debt issuance cost						$ 3,400,000
Debt instrument, discount percent						99.847%
Effective interest rate						4.45%
Unamortized debt issuance cost		700,000
Unsecured Notes Two | Revolving Credit Facility
Debt Instrument [Line Items]
Loan maximum borrowing capacity	$ 200,000,000				$ 75,000,000
Drawn down amount under credit facility		200,000,000		25,000,000
Unsecured Notes Two | Revolving Credit Facility | Consolidated Insurance Subsidiary
Debt Instrument [Line Items]
Drawn down amount under credit facility contributed		150,000,000
Unsecured Notes Two | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Effective interest rate			6.75%
Drawn down amount under credit facility			$ 200,000,000
Remaining amount available to be drawn			$ 0
Unsecured debt
Debt Instrument [Line Items]
Notes payable		$ 373,629,000		373,330,000
Unsecured debt | Notes payable | Level 2 | Unsecured Notes One
Debt Instrument [Line Items]
Interest rate		4.40%
Unsecured debt		$ 375,000,000		375,000,000		$ 375,000,000
Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two
Debt Instrument [Line Items]
Unsecured debt				$ 25,000,000
Minimum | Unsecured Notes Two | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee on undrawn portion of facility	0.125%	0.175%
Maximum | Unsecured Notes Two | Revolving Credit Facility
Debt Instrument [Line Items]
Debt to total capital ratio		0.295
Commitment fee on undrawn portion of facility	0.225%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Unsecured Notes Two | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%
Debt to total capital ratio	0.20
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Unsecured Notes Two | Revolving Credit Facility
Debt Instrument [Line Items]
Debt to total capital ratio	0.30
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%