Business Combination (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Assets acquired
Goodwill	$ 680	$ 680		$ 680
Liabilities assumed
Homebuilding revenues	232,833		$ 183,506	446,100	$ 352,134
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	36,185		21,456	58,941	36,775
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	686	1,500	1,021	1,242	1,665
Temporary Equity, Accretion to Redemption Value	1,892		1,720	863	2,840
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	0			0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0		(197)	0	257
Payment for Contingent Consideration Liability, Operating Activities				(5,267)	(1,332)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	12,485	$ 13,611	12,509	12,485	12,509	$ 11,412	$ 8,531	$ 10,295
Payments for Repurchase of Redeemable Noncontrolling Interest	$ (1,505)		$ (527)	$ (1,505)	$ (527)
GHO Homes [Member]
Liabilities assumed
Ownership percentage by noncontrolling owners	20.00%			20.00%