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Net Income Attributable to Green Brick Partners, Inc. Per Share (Antidilutive Options Excluded From Calculation of Earnings Per Share) (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Antidilutive options to purchase common stock and restricted stock awards (in shares) 3 0 7 0