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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Sale of residential units                 $ 435,644 $ 365,164 $ 254,267
Sale of land and lots                 18,730 15,164 36,878
Revenues $ 136,380 $ 113,706 $ 104,951 $ 99,337 $ 119,764 $ 91,670 $ 98,936 $ 69,958 454,374 380,328 291,145
Gross profit 28,831 $ 25,410 $ 22,926 $ 21,286 29,201 $ 20,644 $ 22,116 $ 14,414 98,453 86,375 62,252
Income before taxes                 64,237 50,554 34,716
Inventory 495,655       410,297       495,655 410,297 344,132
Land Development                      
Segment Reporting Information [Line Items]                      
Gross profit, land development                 5,454 4,600 9,635
Income before taxes, land development                 4,320 3,611 5,118
Inventory 272,542       232,726       272,542 232,726 188,153
Land Development | Segment Restructuring                      
Segment Reporting Information [Line Items]                      
Gross profit, land development                     100
Operating Segments | Builder Operations | Segment Restructuring                      
Segment Reporting Information [Line Items]                      
Inventory                     (63,400)
Operating Segments | Texas                      
Segment Reporting Information [Line Items]                      
Sale of residential units                 220,887 201,473 121,979
Gross profit, builder operations                 53,240 50,320 29,992
Income before taxes, builder operations                 36,224 34,939 19,945
Inventory 110,872       76,878       110,872 76,878 61,403
Operating Segments | Georgia                      
Segment Reporting Information [Line Items]                      
Sale of residential units                 214,757 163,942 132,288
Gross profit, builder operations                 49,052 37,114 31,733
Income before taxes, builder operations                 34,636 24,639 21,744
Inventory 99,613       90,859       99,613 90,859 86,707
Operating Segments | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Sale of residential units                 0 0 0
Gross profit, builder operations                 (9,293) (5,659) (9,108)
Income before taxes, builder operations                 (10,943) (12,635) (12,091)
Inventory $ 12,628       $ 9,834       12,628 9,834 7,869
Operating Segments | Land Development                      
Segment Reporting Information [Line Items]                      
Sale of land and lots                 $ 18,730 $ 14,913 $ 36,878