Significant Accounting Policies (Schedule of Real Estate Inventory Capitalized Interest Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Interest capitalized at beginning of year	$ 9,417	$ 9,085	$ 3,713
Interest incurred	4,456	3,218	9,625
Interest charged to cost of sales	(3,399)	(2,886)	(3,972)
Interest charged to interest expense	0	0	(281)
Interest capitalized at end of year	$ 10,474	$ 9,417	$ 9,085