Inventory (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished Homes and Homes under Construction	$ 302,070,000	$ 302,070,000		$ 314,966,000
Inventory, Real Estate, Land and Land Development Costs	470,791,000	470,791,000		437,553,000
Inventory, Land Held-for-sale	6,499,000	6,499,000		1,048,000
Total inventory	779,360,000	$ 779,360,000		$ 753,567,000
Document Period End Date		Sep. 30, 2020
Earnest Money Deposits and Pre-acquisition Costs Written-Off		$ 1,490,000	$ 520,000
Impairment of Real Estate	0.0	0.0	$ 0.1
Inventory with potential indicators of impairment	$ 8,200,000	$ 8,200,000