Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 961,040	$ 714,194	$ 1,789,816	$ 1,291,797
Operating Income	141,714	74,239	253,011	120,243
Interest Expense	452	2,515	1,628	7,215
Equity in loss (income) from joint venture arrangements	(35)	(3)	(195)	(55)
Income before income taxes	141,297	71,727	251,578	113,083
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	417,787	299,340	750,785	539,610
Operating Income	61,982	32,241	100,966	53,122
Interest Expense	0	703	76	2,514
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	514,618	395,806	980,747	719,672
Operating Income	79,064	44,319	145,279	73,176
Interest Expense	0	1,192	157	3,350
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	28,635	19,048	58,284	32,515
Operating Income	18,925	11,457	39,561	17,819
Interest Expense	949	620	1,892	1,351
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	(18,257)	(13,778)	(32,795)	(23,874)
Interest Income	$ (497)	$ 0	$ (497)	$ 0