Supplemental Guarantor Information Supplemental Guarantor Information - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 437,857	$ 406,980
Land and housing	348,702	320,281
General and administrative	27,951	27,760
Selling	30,063	27,283
Acquisition and integration costs	1,700	0
Equity in income of joint venture arrangements	(310)	(17)
Interest	5,878	5,338
Total costs and expenses	413,984	380,645
Income before income taxes	23,873	26,335
Provision for income taxes	5,810	9,452
Equity In subsidiaries	0	0
Net income	18,063	16,883
Preferred Dividends	0	1,219
Net income to common shareholders	18,063	15,664
Consolidation, Eliminations [Member]
Revenue	0	0
Land and housing	0	0
General and administrative	0	0
Selling	0	0
Acquisition and integration costs	0
Equity in income of joint venture arrangements	0	0
Interest	0	0
Total costs and expenses	0	0
Income before income taxes	0	0
Provision for income taxes	0	0
Equity In subsidiaries	(18,063)	(16,883)
Net income	(18,063)	(16,883)
Preferred Dividends		0
Net income to common shareholders		(16,883)
Parent Company [Member]
Revenue	0	0
Land and housing	0	0
General and administrative	0	0
Selling	0	0
Acquisition and integration costs	0
Equity in income of joint venture arrangements	0	0
Interest	0	0
Total costs and expenses	0	0
Income before income taxes	0	0
Provision for income taxes	0	0
Equity In subsidiaries	18,063	16,883
Net income	18,063	16,883
Preferred Dividends		1,219
Net income to common shareholders		15,664
Guarantor Subsidiaries [Member]
Revenue	422,831	392,673
Land and housing	348,702	320,281
General and administrative	22,171	22,460
Selling	30,063	27,283
Acquisition and integration costs	1,700
Equity in income of joint venture arrangements	0	0
Interest	5,108	4,670
Total costs and expenses	407,744	374,694
Income before income taxes	15,087	17,979
Provision for income taxes	3,906	6,489
Equity In subsidiaries	0	0
Net income	11,181	11,490
Preferred Dividends		0
Net income to common shareholders		11,490
Non-Guarantor Subsidiaries [Member]
Revenue	15,026	14,307
Land and housing	0	0
General and administrative	5,780	5,300
Selling	0	0
Acquisition and integration costs	0
Equity in income of joint venture arrangements	(310)	(17)
Interest	770	668
Total costs and expenses	6,240	5,951
Income before income taxes	8,786	8,356
Provision for income taxes	1,904	2,963
Equity In subsidiaries	0	0
Net income	$ 6,882	5,393
Preferred Dividends		0
Net income to common shareholders		$ 5,393