Inventory (Details) $ in Thousands, number in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Inventory Disclosure [Abstract]
Finished Homes and Homes under Construction	$ 321,058		$ 268,763
Inventory, Real Estate, Land and Land Development Costs	418,700		399,809
Inventory, Land Held-for-sale	1,041		389
Total inventory	$ 740,799		$ 668,961
Inventory Operative Builders With Potential Indicators Of Impairment	10.7
Inventory Write-down	$ 100	$ 100