Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 48,600	$ 45,357
Inventory	2,304,543	1,871,251
Investment in joint venture arrangements	42,466	34,673
Other assets	650,991	691,764
Total assets	3,046,600	2,643,045
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	4,079	5,031
Inventory	950,220	847,524
Investment in joint venture arrangements	0	1,378
Other assets	40,229	37,465
Total assets	994,528	891,398
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	44,521	40,326
Inventory	1,354,323	1,023,727
Investment in joint venture arrangements	42,466	33,295
Other assets	72,983	57,588
Total assets	1,514,293	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	537,779	596,711
Total assets	$ 537,779	$ 596,711