Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues:
Builder operations	$ 143,878	$ 100,345	$ 264,244	$ 193,742
Land development	11,132	4,606	19,031	10,546
Total revenues	155,010	104,951	283,275	204,288
Gross profit:
Total gross profit	34,618	22,926	61,748	44,212
Income (loss) before taxes:
Income before taxes	24,230	13,813	40,841	25,928
Inventory:
Total inventory	581,368		581,368		$ 496,054
Goodwill:
Goodwill	1,725		1,725		0
Operating Segments | Builder operations
Revenues:
Land development	400	0	4,300	0
Operating Segments | Builder operations | Texas
Revenues:
Builder operations	66,893	46,710	138,441	97,380
Gross profit:
Builder operations	15,432	12,063	32,449	24,373
Income (loss) before taxes:
Builder operations	9,942	7,878	21,042	16,253
Inventory:
Total inventory	128,062		128,062		111,271
Operating Segments | Builder operations | Georgia
Revenues:
Builder operations	66,556	53,635	119,274	96,362
Gross profit:
Builder operations	16,294	11,774	28,158	21,122
Income (loss) before taxes:
Builder operations	12,243	8,213	20,221	14,315
Inventory:
Total inventory	105,699		105,699		99,613
Operating Segments | Builder operations | Florida
Revenues:
Builder operations	10,869	0	10,869	0
Gross profit:
Builder operations	2,511	0	2,511	0
Income (loss) before taxes:
Builder operations	1,108	0	1,108	0
Inventory:
Total inventory	41,645		41,645		0
Goodwill:
Goodwill	1,725		1,725		0
Operating Segments | Land development
Revenues:
Land development	10,692	4,606	14,691	10,546
Gross profit:
Land development	3,164	1,287	4,449	3,115
Income (loss) before taxes:
Land development	2,664	873	3,683	2,378
Inventory:
Total inventory	291,251		291,251		272,542
Corporate and other
Revenues:
Total revenues	0	0	0	0
Gross profit:
Total gross profit	(2,783)	(2,198)	(5,819)	(4,398)
Income (loss) before taxes:
Income before taxes	(1,727)	$ (3,151)	(5,213)	$ (7,018)
Inventory:
Total inventory	$ 14,711		$ 14,711		$ 12,628