Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands			3 Months Ended
	Jan. 01, 2018	Aug. 04, 2017	Mar. 31, 2018	Dec. 31, 2017	Oct. 31, 2017
Summary of Significant Accounting Policies [Line Items]
Forfeited deposits			$ 100,000
Other income, land sales to third parties			2,000,000
Cost of land dispositions			2,100,000
Deferred revenue, related to unsatisfied performance obligations			1,400,000
Deferred costs, related to unsatisfied performance obligations			1,100,000
Reclassification of costs from inventory to property and equipment	$ 2,300,000
Decrease retained earnings	$ 600,000
Earnest money deposits			17,537,000	$ 14,077,000
Homes Closed With Outstanding Deposits [Member]
Summary of Significant Accounting Policies [Line Items]
Home sales revenue			6,600,000
UCP, Inc [Member]
Summary of Significant Accounting Policies [Line Items]
Conversion of stock, ratio		0.2309%
Business combination net of acquired cash		$ 100,150.0000
Purchase price		$ 209,036,000
Home sales revenue			103,400,000
Sundquist [Member]
Summary of Significant Accounting Policies [Line Items]
Purchase price					$ 50,203,000
Home sales revenue			$ 21,400,000
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated life of the community based			2 years
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated life of the community based			3 years
Common Class A [Member] | UCP, Inc [Member]
Summary of Significant Accounting Policies [Line Items]
Conversion of stock, cash		$ 5.32
Century Common Stock [Member] | UCP, Inc [Member]
Summary of Significant Accounting Policies [Line Items]
Shares issued in connection to merger		4,176