Supplemental Guarantor Information Supplemental Guarantor Information - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 623,686	$ 558,098	$ 1,104,795	$ 995,955
Land and housing	503,857	449,336	892,324	798,038
General and administrative	36,164	34,666	66,863	62,617
Selling	37,452	35,591	69,003	65,654
Acquisition and integration costs	0	0	0	1,700
Equity in loss (income) from joint venture arrangements	(187)	86	(66)	(224)
Interest	5,197	4,888	11,989	10,766
Total costs and expenses	582,483	524,567	1,040,113	938,551
Income before income taxes	41,203	33,531	64,682	57,404
Provision for income taxes	10,957	5,620	16,713	11,430
Equity In subsidiaries	0	0	0	0
Net income	30,246	27,911	47,969	45,974
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	(30,246)	(27,911)	(47,969)	(45,974)
Net income	(30,246)	(27,911)	(47,969)	(45,974)
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	30,246	27,911	47,969	45,974
Net income	30,246	27,911	47,969	45,974
Guarantor Subsidiaries [Member]
Revenue	609,383	546,222	1,078,709	969,053
Land and housing	503,857	449,336	892,324	798,038
General and administrative	29,315	28,570	53,748	50,741
Selling	37,452	35,591	69,003	65,654
Acquisition and integration costs				1,700
Equity in loss (income) from joint venture arrangements	0	0	0	0
Interest	4,263	4,193	10,312	9,301
Total costs and expenses	574,887	517,690	1,025,387	925,434
Income before income taxes	34,496	28,532	53,322	43,619
Provision for income taxes	9,578	4,552	14,333	8,458
Equity In subsidiaries	0	0	0	0
Net income	24,918	23,980	38,989	35,161
Non-Guarantor Subsidiaries [Member]
Revenue	14,303	11,876	26,086	26,902
Land and housing	0	0	0	0
General and administrative	6,849	6,096	13,115	11,876
Selling	0	0	0	0
Acquisition and integration costs				0
Equity in loss (income) from joint venture arrangements	(187)	86	(66)	(224)
Interest	934	695	1,677	1,465
Total costs and expenses	7,596	6,877	14,726	13,117
Income before income taxes	6,707	4,999	11,360	13,785
Provision for income taxes	1,379	1,068	2,380	2,972
Equity In subsidiaries	0	0	0	0
Net income	$ 5,328	$ 3,931	$ 8,980	$ 10,813