Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 828,776	$ 577,603
Operating Income	111,297	46,004
Interest	1,176	4,700
Equity in loss (income) from joint venture arrangements	(160)	(52)
Income before income taxes	110,281	41,356
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	332,998	240,270
Operating Income	38,984	20,881
Interest	76	1,811
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	466,129	323,866
Operating Income	66,215	28,857
Interest	157	2,158
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	29,649	13,467
Operating Income	20,636	6,362
Interest	943	731
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	$ (14,538)	$ (10,096)