Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Costs and Expenses [Abstract]
Revenue	$ 558,098	$ 456,866	$ 995,955	$ 863,846
Land and housing	449,336	367,598	798,038	687,879
General and administrative	34,666	30,112	62,617	57,872
Selling	35,591	30,247	65,654	57,530
Acquisition and integration costs	0	0	1,700	0
Equity in loss (income) from joint venture arrangements	86	(110)	(224)	(127)
Interest	4,888	3,834	10,766	9,172
Total costs and expenses	524,567	431,681	938,551	812,326
Income before income taxes	33,531	25,185	57,404	51,520
Provision for income taxes	5,620	8,196	11,430	17,648
Net income	27,911	16,989	45,974	33,872
Preferred Dividends	0	1,219	0	2,438
Net income to common shareholders	$ 27,911	$ 15,770	$ 45,974	$ 31,434
Earnings per common share:
Basic	$ 0.98	$ 0.63	$ 1.62	$ 1.26
Diluted	$ 0.96	$ 0.55	$ 1.56	$ 1.09
Weighted Average Number of Shares Outstanding [Abstract]
Basic	28,571	24,990	28,349	24,864
Diluted	29,101	30,619	29,818	30,471