Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item state segment	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Number of operating states | state	17
Number of operating segments | segment	5
Earnest money deposits	$ 30,600	$ 10,600
Number of communities impairment charges | item	4	5
Impairment of real estate	$ 2,200	$ 2,000
Non-refundable cash deposits classified in prepaid expenses and other assets	31,300	40,000
Advertising and marketing costs	11,300	17,000	$ 17,400
Mortgage loans held for sale	282,639	185,246
Gains on sale of mortgage loans	72,800	32,200	$ 22,000
Tax valuation allowance	0	0
Reserves for uncetain tax positions	0	0
Goodwill impairment	0	0
Inspire [Member]
Mortgage loans in process	172,300	37,600
Mortgage loans held for sale	282,600	185,200
Mortgage loans held for sale aggregate outstanding principal balance	$ 269,600	$ 179,300
Weighted Average [Member] | Inspire [Member]
Interest rate	2.80%	3.90%
Trade Names [Member] | Wade Jurney Homes [Member]
Gain (loss) on assets impairment		$ (2,800)
Cell Phone Tower Lease [Member] | Wade Jurney Homes [Member]
Gain (loss) on assets impairment		$ 800
Model Homes And Sales Facilities [Member] | Minimum [Member]
Estimated useful life	2 years
Model Homes And Sales Facilities [Member] | Maximum [Member]
Estimated useful life	3 years