Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Builder operations	$ 120,366	$ 93,397
Land development	7,899	5,940
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Builder operations	120,366	93,397
Land development	7,899	5,940
Residential units
Disaggregation of Revenue [Line Items]
Builder operations	120,366	93,397
Land development	0	0
Land and lots
Disaggregation of Revenue [Line Items]
Builder operations	0	0
Land development	7,899	5,940
Homebuyers
Disaggregation of Revenue [Line Items]
Builder operations	120,366	93,397
Land development	0	0
Homebuilders
Disaggregation of Revenue [Line Items]
Builder operations	0	0
Land development	7,899	5,940
Builder operations | Texas
Disaggregation of Revenue [Line Items]
Builder operations	71,548	50,670
Land development	0	0
Builder operations | Georgia
Disaggregation of Revenue [Line Items]
Builder operations	48,818	42,727
Land development	0	0
Land development | Texas
Disaggregation of Revenue [Line Items]
Builder operations	0	0
Land development	3,999	5,753
Land development | Georgia
Disaggregation of Revenue [Line Items]
Builder operations	0	0
Land development	$ 3,900	$ 187