Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 847,921	$ 653,345	$ 2,139,718	$ 1,758,140
Operating Income	96,096	54,649	216,339	131,254
Interest	1,239	4,637	8,454	16,626
Equity in loss (income) from joint venture arrangements	(252)	(52)	(307)	(118)
Income before income taxes	95,109	50,064	208,192	114,746
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	350,591	270,063	890,201	723,295
Operating Income	38,365	29,587	91,487	70,559
Interest	122	1,505	2,636	5,360
Purchase Accounting Adjustments		100		600
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	468,384	369,828	1,188,056	995,305
Operating Income	55,861	32,500	129,037	76,308
Interest	409	2,146	3,759	8,602
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	28,946	13,454	61,461	39,540
Operating Income	19,887	6,609	37,706	19,943
Interest	708	986	2,059	2,664
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	$ (18,017)	$ (14,047)	$ (41,891)	$ (35,556)