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Debt (Narrative) (Details) - Line of Credit		9 Months Ended
	Apr. 28, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revolving Credit Facility
Debt Instrument [Line Items]
Construction loan	$ 125,000,000
Delayed term loan period	5 years
Line of credit borrowing capacity		$ 250,000,000
Accordion feature borrowing capacity		50,000,000
Line of credit, borrowing capacity including accordion feature		300,000,000
Outstanding borrowing		$ 0	$ 0
Maximum allowable consolidated funded indebtedness ratio (percent)		0.35
Minimum net worth required		$ 912,000,000
Minimum liquidity required		$ 25,000,000
Revolving Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate for debt		0.50%
Revolving Credit Facility | One Month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate for debt		1.00%
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentages (percent)		0.20%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentages (percent)		0.45%
Revolving Credit Agreement | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate for debt		0.00%
Term Loan | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate for debt		2.375%

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Banking Regulation, Mortgage Banking, Minimum Liquidity

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of minimum net worth required for mortgage banking as defined by regulatory framework.

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