Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 714,194	$ 623,686	$ 1,291,797	$ 1,104,795
Operating Income	74,239	46,213	120,243	76,605
Interest	2,515	5,197	7,215	11,989
Equity in loss (income) from joint venture arrangements	(3)	(187)	(55)	(66)
Income before income taxes	71,727	41,203	113,083	64,682
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	299,340	252,870	539,610	453,232
Operating Income	32,241	24,437	53,122	40,972
Interest	703	1,374	2,514	3,855
Purchase Accounting Adjustments		100		600
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	395,806	356,513	719,672	625,477
Operating Income	44,319	26,214	73,176	43,808
Interest	1,192	2,888	3,350	6,456
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	19,048	14,303	32,515	26,086
Operating Income	11,457	7,639	17,819	13,334
Interest	620	935	1,351	1,678
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	$ (13,778)	$ (12,077)	$ (23,874)	$ (21,509)