Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 904,319	$ 847,921	$ 2,694,135	$ 2,139,718
Operating Income	125,220	96,096	378,231	216,339
Interest Expense		1,239	1,554	8,454
Interest income	(74)
Equity in loss (income) from joint venture arrangements	50	(252)	(145)	(307)
Gain (Loss) on Extinguishment of Debt	9,072	0	9,072	0
Income before income taxes	116,172	95,109	367,750	208,192
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	400,564	350,591	1,151,349	890,201
Operating Income	59,009	38,365	159,975	91,487
Interest Expense	0	122	76	2,636
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	482,960	468,384	1,463,707	1,188,056
Operating Income	72,957	55,861	218,236	129,037
Interest Expense		409		3,759
Interest income	(381)		(224)
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	20,795	28,946	79,079	61,461
Operating Income	10,820	19,887	50,381	37,706
Interest Expense	885	708	2,777	2,059
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	(17,566)	(18,017)	(50,361)	(41,891)
Interest Income	$ (578)	$ 0	$ (1,075)	$ 0