Segment Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 185,120,000	$ 152,052,000	$ 157,312,000	$ 129,163,000	$ 137,424,000	$ 114,342,000	$ 105,750,000	$ 100,734,000	$ 623,647,000	$ 458,250,000	$ 390,985,000
Gross profit	36,988,000	$ 31,004,000	$ 35,070,000	$ 27,268,000	28,997,000	$ 25,506,000	$ 23,031,000	$ 21,500,000	130,330,000	99,034,000	87,762,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									81,671,000	64,237,000	50,554,000
Inventory, Real Estate	668,961,000				496,054,000				668,961,000	496,054,000	410,297,000
Land development
Segment Reporting Information [Line Items]
Income before taxes, land development									6,155,000	4,320,000	3,611,000
Inventory, Real Estate	329,105,000				272,542,000				329,105,000	272,542,000	232,726,000
6552 Land Subdividers and Developers (No Cemeteries) [Member]
Segment Reporting Information [Line Items]
Revenues									39,834,000	18,730,000	14,913,000
Gross profit, land development									9,334,000	5,454,000	4,600,000
Operating Segments
Segment Reporting Information [Line Items]
Gross profit, builder operations									(134,069,000)	(102,873,000)	(88,821,000)
Operating Segments | TEXAS
Segment Reporting Information [Line Items]
Gross profit, builder operations									(61,882,000)	(53,840,000)	(51,013,000)
Income before taxes, builder operations									37,535,000	36,224,000	34,939,000
Inventory, Real Estate	160,980,000				111,271,000				160,980,000	111,271,000	76,878,000
Operating Segments | GEORGIA
Segment Reporting Information [Line Items]
Gross profit, builder operations									(72,187,000)	(49,033,000)	(37,808,000)
Income before taxes, builder operations									47,237,000	34,636,000	24,639,000
Inventory, Real Estate	159,616,000				99,613,000				159,616,000	99,613,000	90,859,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Gross profit, builder operations									(13,073,000)	(9,293,000)	(5,659,000)
Income before taxes, builder operations									(9,256,000)	(10,943,000)	(12,635,000)
Inventory, Real Estate	$ 19,260,000				$ 12,628,000				19,260,000	12,628,000	9,834,000
Central [Domain] | Home Building [Member]
Segment Reporting Information [Line Items]
Revenues									282,218,000	224,670,000	206,831,000
Southeast [Domain] | Home Building [Member]
Segment Reporting Information [Line Items]
Revenues									301,595,000	214,850,000	169,241,000
Real Estate, Other [Member]
Segment Reporting Information [Line Items]
Revenues									44,754,000	18,730,000	15,164,000
Real Estate, Other [Member] | Home Building [Member]
Segment Reporting Information [Line Items]
Revenues									0	0	0
Real Estate, Other [Member] | Central [Domain]
Segment Reporting Information [Line Items]
Revenues									40,184,000	17,928,000	14,201,000
Real Estate, Other [Member] | Southeast [Domain]
Segment Reporting Information [Line Items]
Revenues									$ 4,570,000	$ 802,000	$ 963,000