Supplemental Guarantor Information Supplemental Guarantor Information - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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
Equity in subsidiaries	0	0	0	0
Net income	37,838	29,282	85,807	75,256
Consolidation, Eliminations [Member]
Revenue	0	0	0	0
Land and housing	0	0	0	0
General and administrative	0	0	0	0
Selling	0	0	0	0
Acquisition and integration costs				0
Equity in loss (income) from joint venture arrangements	0	0	0	0
Interest	0	0	0	0
Total costs and expenses	0	0	0	0
Income before income taxes	0	0	0	0
Provision for income taxes	0	0	0	0
Equity in subsidiaries	(37,838)	(29,282)	(85,807)	(75,256)
Net income	(37,838)	(29,282)	(85,807)	(75,256)
Parent Company [Member]
Revenue	0	0	0	0
Land and housing	0	0	0	0
General and administrative	0	0	0	0
Selling	0	0	0	0
Acquisition and integration costs				0
Equity in loss (income) from joint venture arrangements	0	0	0	0
Interest	0	0	0	0
Total costs and expenses	0	0	0	0
Income before income taxes	0	0	0	0
Provision for income taxes	0	0	0	0
Equity in subsidiaries	37,838	29,282	85,807	75,256
Net income	37,838	29,282	85,807	75,256
Guarantor Subsidiaries [Member]
Revenue	639,891	555,649	1,718,600	1,524,702
Land and housing	519,164	452,029	1,411,488	1,250,067
General and administrative	32,332	30,180	86,080	80,921
Selling	40,147	35,054	109,150	100,708
Acquisition and integration costs				1,700
Equity in loss (income) from joint venture arrangements	0	0	0	0
Interest	3,650	3,592	13,962	12,893
Total costs and expenses	595,293	520,855	1,620,680	1,446,289
Income before income taxes	44,598	34,794	97,920	78,413
Provision for income taxes	11,222	9,253	25,555	17,711
Equity in subsidiaries	0	0	0	0
Net income	33,376	25,541	72,365	60,702
Non-Guarantor Subsidiaries [Member]
Revenue	13,454	12,193	39,540	39,095
Land and housing	0	0	0	0
General and administrative	7,053	6,717	20,168	18,593
Selling	0	0	0	0
Acquisition and integration costs				0
Equity in loss (income) from joint venture arrangements	(52)	(44)	(118)	(268)
Interest	987	834	2,664	2,299
Total costs and expenses	7,988	7,507	22,714	20,624
Income before income taxes	5,466	4,686	16,826	18,471
Provision for income taxes	1,004	945	3,384	3,917
Equity in subsidiaries	0	0	0	0
Net income	$ 4,462	$ 3,741	$ 13,442	$ 14,554