Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Builder operations	$ 143,878	$ 100,345	$ 264,244	$ 193,742
Land development	11,132	4,606	19,031	10,546
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Builder operations	143,878	100,345	264,244	193,742
Land development	11,132	4,606	19,031	10,546
Residential units
Disaggregation of Revenue [Line Items]
Builder operations	143,878	100,345	264,244	193,742
Land development	0	0	0	0
Land and lots
Disaggregation of Revenue [Line Items]
Builder operations	0	0	0	0
Land development	11,132	4,606	19,031	10,546
Homebuyers
Disaggregation of Revenue [Line Items]
Builder operations	143,878	100,345	264,244	193,742
Land development	0	0	0	0
Homebuilders
Disaggregation of Revenue [Line Items]
Builder operations	0	0	0	0
Land development	11,132	4,606	19,031	10,546
Texas
Disaggregation of Revenue [Line Items]
Builder operations	66,893	46,710	138,441	97,380
Land development	10,692	3,991	14,691	9,744
Georgia
Disaggregation of Revenue [Line Items]
Builder operations	66,116	53,635	114,934	96,362
Land development	440	615	4,340	802
Florida
Disaggregation of Revenue [Line Items]
Builder operations	10,869	0	10,869	0
Land development	$ 0	$ 0	$ 0	$ 0