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Business Combination (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Payment for Contingent Consideration Liability, Investing Activities     $ 1,800      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 12,209   12,209   $ 12,509 $ 8,531
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 863   2,528      
Temporary Equity, Interest in Subsidiary Earnings 0   (527)      
Noncontrolling Interest, Change in Redemption Value (1,163)   (1,677)      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low 3,000   3,000      
Assets acquired            
Goodwill 680   680     $ 680
Liabilities assumed            
Contingent consideration 3,900   3,900      
Homebuilding revenues 209,404 $ 152,052 561,538 $ 438,527    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 24,972 $ 20,107 $ 61,747 $ 60,948    
GHO Homes [Member]            
Liabilities assumed            
Percent of equity interests acquired 80.00%   80.00%      
Ownership percentage by noncontrolling owners 20.00%   20.00%