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Business Combination (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]          
Payment for Contingent Consideration Liability, Investing Activities     $ 1,800    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 12,509   12,509   $ 8,531
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest     1,665    
Temporary Equity, Interest in Subsidiary Earnings     (527) $ 0  
Noncontrolling Interest, Change in Redemption Value     2,840    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low 1,900   1,900    
Assets acquired          
Goodwill 680   680   $ 680
Liabilities assumed          
Contingent consideration 3,500   3,500    
Homebuilding revenues 183,506 $ 157,312 352,134 286,475  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 21,456 $ 24,230 $ 36,775 $ 40,841  
GHO Homes [Member]          
Liabilities assumed          
Percent of equity interests acquired 80.00%   80.00%    
Ownership percentage by noncontrolling owners 20.00%   20.00%