Business Combination (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Assets acquired
Goodwill	$ 680			$ 680		$ 680
Liabilities assumed
Homebuilding revenues	275,821		$ 209,404	721,921	$ 561,538
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	45,923		24,972	104,864	61,747
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	501	$ 1,500	863	1,743	2,528
Temporary Equity, Accretion to Redemption Value	(638)		(1,163)	(225)	(1,677)
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	400			400
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	210		1,492	(210)	1,749
Payment for Contingent Consideration Liability, Operating Activities				(5,267)	(1,332)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	13,624		12,209	13,624	12,209	$ 13,611	$ 12,485	$ 8,531	$ 12,509
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 0		$ 0	$ (1,505)	$ (527)
GHO Homes [Member]
Liabilities assumed
Ownership percentage by noncontrolling owners	20.00%			20.00%