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Business Segments Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 577,603	$ 481,109
Operating Income	46,004	30,392
Interest	4,700	6,792
Equity in loss (income) from joint venture arrangements	(52)	121
Income before income taxes	41,356	23,479
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	240,270	200,362
Operating Income	20,881	16,535
Interest	1,811	2,481
Purchase Accounting Adjustments		400
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	323,866	268,964
Operating Income	28,857	17,594
Interest	2,158	3,568
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	13,467	11,783
Operating Income	6,362	5,695
Interest	731	743
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	$ (10,096)	$ (9,432)

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