Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 14, 2022
Debt Instrument
Other Notes Payable	$ 70,966,000	$ 55,228,000
Debt Instrument, Term	6 years
Notes Payable Issued to Acquire Land	$ 46,700,000	39,100,000	$ 50,900,000
Repayments of Long-term Debt	123,290,000	4,856,000	836,893,000
(Gain) loss on debt retirement	(663,000)	0	61,469,000
Borrowings under revolving credit facility	0	2,869,000,000	0
Repayments under revolving credit facility	0	(2,869,000,000)	0
Letters of credit outstanding, amount	312,700,000	303,400,000
Unused credit lines	$ 937,300,000	946,600,000
Maximum
Debt Instrument
Debt instrument, interest rate, stated percentage	6.00%
Unsecured Letter Of Credit Facility [Member]
Debt Instrument
Letters of credit outstanding, amount	$ 312,700,000	303,400,000
Revolving Credit Facility [Member]
Debt Instrument
Financial Services debt	0	0
Revolving Credit Facility Accordion Feature [Member]
Debt Instrument
Maximum borrowing capacity				$ 1,800,000,000
Financial Services
Debt Instrument
Unused credit lines	$ 350,400,000	$ 213,300,000
Weighted-average interest rate	7.15%	5.39%
Weighted-average interest rate	7.15%	5.39%
Financial Services | Repurchase Agreement [Member]
Debt Instrument
Maximum borrowing capacity	$ 850,000,000			$ 1,300,000,000
Line of Credit Facility, Accordion Feature, Increase Limit	50,000,000
Financial Services debt	499,600,000	$ 586,700,000
Financial Services | Repurchase Agreement [Member] | Minimum
Debt Instrument
Maximum borrowing capacity	600,000,000
Financial Services | Repurchase Agreement [Member] | Maximum
Debt Instrument
Maximum borrowing capacity	700,000,000
Maturing in 2026
Debt Instrument
Repurchased face amount	44,600,000		200,000,000
Maturing in 2027
Debt Instrument
Repurchased face amount	$ 56,100,000		$ 100,000,000
Senior Notes [Member] | Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain]
Debt Instrument
Debt instrument, interest rate, stated percentage	5.00%	5.00%