Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,162,592	$ 1,109,781	$ 2,138,685	$ 2,156,484
Land and housing	875,973	800,501	1,599,283	1,563,861
General and administrative	67,247	63,994	126,320	120,078
Selling	63,655	58,495	116,441	112,435
Operating Income	155,717	186,791	296,641	360,110
Interest income	(4,377)	(7,348)	(9,574)	(14,268)
Other expense (income)	0	0	0	0
Income before income taxes	160,094	194,139	306,215	374,378
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	488,250	464,781	898,627	873,301
Land and housing	376,979	357,830	696,438	677,541
General and administrative	10,823	10,124	19,959	19,565
Selling	24,434	24,006	45,624	45,313
Operating Income	76,014	72,821	136,606	130,882
Interest income	(24)	(56)	(46)	(136)
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	642,892	614,238	1,177,088	1,225,459
Land and housing	498,994	442,671	902,845	886,320
General and administrative	21,004	18,061	39,812	35,631
Selling	38,594	33,756	69,700	65,915
Operating Income	84,300	119,750	164,731	237,593
Interest income	(1)	0	(3)	(398)
Financial Service
Segment Reporting Information [Line Items]
Revenue	31,450	30,762	62,970	57,724
Land and housing	0	0	0	0
General and administrative	13,908	12,879	26,661	24,654
Selling	0	0	0	0
Operating Income	17,542	17,883	36,309	33,070
Interest expense	(3,066)	(3,483)	(5,727)	(6,358)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
General and administrative	21,512	22,930	39,888	40,228
Selling	627	733	1,117	1,207
Selling, general and administrative expenses	(22,139)	(23,663)	(41,005)	(41,435)
Interest income	(7,418)	(10,775)	(15,252)	(20,092)
Operating Segments
Segment Reporting Information [Line Items]
General and administrative	45,735	41,064	86,432	79,850
Selling	63,028	57,762	115,324	111,228
Operating Income	177,856	210,454	337,646	401,545
Interest income	$ (3,041)	$ (3,427)	$ (5,678)	$ (5,824)