Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 42,564	$ 45,357
Inventory	1,917,970	1,871,251
Investment in joint venture arrangements	33,822	34,673
Other assets	715,204	691,764
Total assets	2,709,560	2,643,045
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	5,720	5,031
Inventory	843,821	847,524
Investment in joint venture arrangements	0	1,378
Other assets	40,320	37,465
Total assets	889,861	891,398
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	36,844	40,326
Inventory	1,074,149	1,023,727
Investment in joint venture arrangements	33,822	33,295
Other assets	84,648	57,588
Total assets	1,229,463	1,154,936
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	590,236	596,711
Total assets	$ 590,236	$ 596,711