Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 45,357	$ 28,532
Inventory	1,871,251	1,740,975
Investment in joint venture arrangements	34,673	37,885
Other Combined Assets	691,764	298,202
TOTAL ASSETS	2,643,045	2,105,594
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	5,031	3,655
Inventory	847,524	783,972
Investment in joint venture arrangements	1,378	1,672
Other Combined Assets	37,465	21,564
TOTAL ASSETS	891,398	810,863
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	40,326	24,877
Inventory	1,023,727	957,003
Investment in joint venture arrangements	33,295	36,213
Other Combined Assets	57,588	52,662
TOTAL ASSETS	1,154,936	1,070,755
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 Combined Assets	596,711	223,976
TOTAL ASSETS	$ 596,711	$ 223,976