Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 44,037	$ 45,357
Inventory	2,032,432	1,871,251
Investment in joint venture arrangements	32,833	34,673
Other assets	752,110	691,764
Total assets	2,861,412	2,643,045
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	4,860	5,031
Inventory	873,152	847,524
Investment in joint venture arrangements	0	1,378
Other assets	43,221	37,465
Total assets	921,233	891,398
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	39,177	40,326
Inventory	1,159,280	1,023,727
Investment in joint venture arrangements	32,833	33,295
Other assets	73,660	57,588
Total assets	1,304,950	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	635,229	596,711
Total assets	$ 635,229	$ 596,711