Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Costs and Expenses [Abstract]
Revenue	$ 653,345	$ 567,842	$ 1,758,140	$ 1,563,797
Land and housing	519,164	452,029	1,411,488	1,250,067
General and administrative	39,385	36,897	106,248	99,514
Selling	40,147	35,054	109,150	100,708
Acquisition and integration costs	0	0	0	1,700
Equity in loss (income) from joint venture arrangements	(52)	(44)	(118)	(268)
Interest	4,637	4,426	16,626	15,192
Total costs and expenses	603,281	528,362	1,643,394	1,466,913
Income before income taxes	50,064	39,480	114,746	96,884
Provision for income taxes	12,226	10,198	28,939	21,628
Net income	$ 37,838	$ 29,282	$ 85,807	$ 75,256
Earnings per common share:
Basic	$ 1.35	$ 1.03	$ 3.10	$ 2.65
Diluted	$ 1.32	$ 1.01	$ 3.04	$ 2.56
Weighted Average Number of Shares Outstanding [Abstract]
Basic	27,981	28,469	27,695	28,389
Diluted	28,598	28,906	28,238	29,511