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Investment in Unconsolidated Entities (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 16, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Aug. 31, 2017
Business Acquisition [Line Items]              
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01   $ 0.01  
Goodwill   $ 680   $ 680   $ 0  
Investment in unconsolidated entities   20,806   20,806   $ 16,878  
Equity in income of unconsolidated entity   $ 2,719 $ 968 $ 6,534 $ 968    
Challenger Homes [Member]              
Business Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage             49.90%
Providence Title [Member]              
Business Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage   49.00%   49.00%      
Green Brick Mortgage [Member]              
Business Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage   49.00%   49.00%      
Common Stock | Challenger Homes              
Business Acquisition [Line Items]              
Common stock issued in connection with the investment in the Challenger Subsidiary (in shares) 20,000