Business Segments Business Segments - Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	$ 37,364	$ 28,532
Inventory	1,806,045	1,740,975
Investment in joint venture arrangements	34,038	37,885
Other assets	543,108	298,202
Total assets	2,420,555	2,105,594
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	34,200
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	4,173	3,655
Inventory	832,855	783,972
Investment in joint venture arrangements	1,324	1,672
Other assets	39,462	21,564
Total assets	877,814	810,863
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Deposits on real estate under option or contract	33,191	24,877
Inventory	973,190	957,003
Investment in joint venture arrangements	32,714	36,213
Other assets	64,660	52,662
Total assets	1,103,755	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	438,986	223,976
Total assets	$ 438,986	$ 223,976