Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues:
Builder operations	$ 120,366	$ 93,397
Land development	7,899	5,940
Gross profit:
Total gross profit	27,130	21,286
Income (loss) before taxes:
Income before taxes	16,611	12,115
Operating Segments
Revenues:
Total revenues	128,265	99,337
Gross profit:
Total gross profit	27,130	21,286
Income (loss) before taxes:
Income before taxes	16,611	12,115
Inventory:
Total inventory	528,499		$ 495,655
Operating Segments | Builder operations
Revenues:
Land development	3,900	0
Operating Segments | Builder operations | Texas
Revenues:
Builder operations	71,548	50,670
Gross profit:
Builder operations	17,017	12,310
Income (loss) before taxes:
Builder operations	11,100	8,375
Inventory:
Total inventory	113,320		110,872
Operating Segments | Builder operations | Georgia
Revenues:
Builder operations	52,718	42,727
Gross profit:
Builder operations	11,864	9,348
Income (loss) before taxes:
Builder operations	7,978	6,102
Inventory:
Total inventory	101,996		99,613
Operating Segments | Land development
Revenues:
Land development	3,999	5,940
Gross profit:
Land development	1,285	1,828
Income (loss) before taxes:
Land development	1,019	1,505
Inventory:
Total inventory	299,761		272,542
Corporate and other
Revenues:
Total revenues	0	0
Gross profit:
Total gross profit	(3,036)	(2,200)
Income (loss) before taxes:
Income before taxes	(3,486)	$ (3,867)
Inventory:
Total inventory	$ 13,422		$ 12,628