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Business Acquisition - Royal Oak Homes (Details) $ in Millions		12 Months Ended
	Mar. 13, 2014 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisitions
Amortization of Intangible Assets		$ 0.4	$ 0.3
Royal Oak Homes, LLC
Business Acquisitions
Number of primary residential lots \| item	2,500
Cash payments to acquire businesses	$ 65.0
Earn-out \| Royal Oak Homes, LLC
Business Acquisitions
Liabilities incurred	3.0
Earn-out \| Royal Oak Homes, LLC \| Fair Value
Business Acquisitions
Liabilities incurred		2.1
Trade Name \| Royal Oak Homes, LLC
Business Acquisitions
Intangibles	$ 0.6
Amortization of Intangible Assets		$ 0.2	$ 0.2