Revenue Recognition (Deposits Recognized as Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total deposits recognized as revenue	$ 6,487	$ 4,556	$ 13,747	$ 7,945
Residential units | Homebuyers
Disaggregation of Revenue [Line Items]
Total deposits recognized as revenue	6,007	3,650	13,036	6,659
Land and Lots [Member] | Homebuilders
Disaggregation of Revenue [Line Items]
Total deposits recognized as revenue	$ 480	$ 906	$ 711	$ 1,286