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Business Segments Business Segments - Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Deposits on real estate under option or contract $ 28,391   $ 33,662
Inventory 1,798,677   1,640,798
Investment in joint venture arrangements 47,557   35,870
Other assets 306,978   311,251
Total assets 2,181,603   2,021,581
Assets Held-for-sale, Not Part of Disposal Group 5,600    
Operating lease right-of-use assets 19,059 $ 20,900 0
Northern Homebuilding [Member]      
Segment Reporting Information [Line Items]      
Deposits on real estate under option or contract 3,688   5,725
Inventory 784,533   696,057
Investment in joint venture arrangements 2,768   1,562
Other assets 32,296   19,524
Total assets 823,285   722,868
Southern Homebuilding [Member]      
Segment Reporting Information [Line Items]      
Deposits on real estate under option or contract 24,703   27,937
Inventory 1,014,144   944,741
Investment in joint venture arrangements 44,789   34,308
Other assets 58,377   43,086
Total assets 1,142,013   1,050,072
Corporate, Financial Services and Unallocated [Member]      
Segment Reporting Information [Line Items]      
Deposits on real estate under option or contract 0   0
Inventory 0   0
Investment in joint venture arrangements 0   0
Other assets 216,305   248,641
Total assets $ 216,305   $ 248,641