Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 32,988	$ 28,532
Inventory	1,797,822	1,740,975
Investment in joint venture arrangements	45,144	37,885
Other assets	451,754	298,202
Total assets	2,327,708	2,105,594
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	32,800
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	3,831	3,655
Inventory	830,011	783,972
Investment in joint venture arrangements	2,081	1,672
Other assets	40,734	21,564
Total assets	876,657	810,863
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	29,157	24,877
Inventory	967,811	957,003
Investment in joint venture arrangements	43,063	36,213
Other assets	69,123	52,662
Total assets	1,109,154	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 assets	341,897	223,976
Total assets	$ 341,897	$ 223,976