Summary of Significant Accounting Policies (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment
Property, plant and equipment	$ 30,566,000	$ 25,437,000
Model home furnishings	28,800,000	24,100,000
Accumulated depreciation	44,300,000	37,800,000
Advertising Costs
Advertising costs	6,000,000	5,400,000	4,600,000
Other Income
Other income	$ 2,402,000	$ 1,700,000	$ 1,315,000