Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,142,909	$ 1,046,371	$ 3,299,393	$ 3,060,914
Operating Income	181,993	172,131	542,103	457,376
Interest income	(6,680)	(5,834)	(20,948)	(11,893)
Other expense (income)	0	1	0	(34)
Income before income taxes	188,673	177,964	563,051	469,303
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	498,503	348,240	1,371,804	1,114,856
Operating Income	75,485	43,762	206,367	129,775
Interest income	(59)	(48)	(195)	(141)
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	614,436	674,540	1,839,895	1,871,920
Operating Income	114,140	135,627	351,733	343,151
Interest income	(618)	0	(1,016)	(205)
Financial Service
Segment Reporting Information [Line Items]
Revenue	29,970	23,591	87,694	74,138
Operating Income	16,568	12,471	49,638	41,182
Interest expense	(3,632)	(2,593)	(9,990)	(7,504)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	(24,200)	(19,729)	(65,635)	(56,732)
Interest income	$ (9,635)	$ (8,379)	$ (29,727)	$ (19,051)