Business Combination (Narrative) (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Assets acquired
Goodwill	$ 680,000				$ 680,000		$ 680,000
Liabilities assumed
Homebuilding revenues	342,340,000			$ 275,821,000	950,625,000	$ 721,921,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	65,158,000			45,923,000	174,397,000	104,864,000
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	623,000			501,000	1,694,000	1,743,000
Temporary Equity, Accretion to Redemption Value					(2,275,000)	(225,000)
Payment for Contingent Consideration Liability, Operating Activities					(368,000)	(5,267,000)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	17,406,000			13,624,000	17,406,000	13,624,000	$ 13,543,000	$ 17,515,000	$ 13,611,000	$ 12,485,000
Payments for Repurchase of Redeemable Noncontrolling Interest	0			0	(106,000)	$ (1,505,000)
Noncontrolling Interest, Change in Redemption Value	$ (732,000)			$ (638,000)	$ 2,275,000
Contingent Consideration Earned			$ 0.4
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid		$ 0.1
GHO Homes [Member]
Liabilities assumed
Ownership percentage by noncontrolling owners	20.00%				20.00%