Investment in Unconsolidated Subsidiaries (Schedule of Unaudited Selected Financial Information) (Details) - WJH [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Inventories	$ 101,649
Total assets	136,531
Total liabilities	91,002
Partners' capital	45,529
Homebuilding revenues	271,653
Income before income tax expense	$ 26,185