Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 24, 2020 USD ($)	Apr. 23, 2019	Jan. 31, 2020	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Payments to acquire businesses, gross					$ 10,400	$ 10,400	$ 83,251
Goodwill impairment				$ 20,200	0	0	20,190
Escrow deposit					42,900	38,400
Restricted cash					41,449	54,477
Finite-Lived Intangible Assets, Net					66,900	78,000
Intangible assets, accumulated amortization					87,700	76,600
Intangible assets amortization expense					11,118	16,502	19,685
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months					10,500
Future Amortization Expense, Year Two					10,000
Future Amortization Expense, Year Three					9,300
Future Amortization Expense, Year Four					8,900
Future Amortization Expense, Year Five					6,500
Property and equipment, net					200,262	149,151
Property and equipment, accumulated depreciation					242,300	228,500
Depreciation Expense					59,800	53,500	46,400
Advertising Expense					61,600	47,200	40,300
Employee benefit plan company contributions					27,600	23,400	20,400
Customer deposits					783,556	844,785
Capitalized contract costs					$ 57,300	$ 44,300
Number of VIEs requiring consolidation					0	0
Residential mortgage loans available-for-sale					$ 677,207	$ 947,139
Residential mortgage loans available-for-sale aggregate outstanding principal balance					680,500	924,500
Net gains from the sale of mortgages					$ 157,300	251,300	247,300
Days past contractual term once loans no longer accrue interest income					90 days
Variability in future cash flows of derivative instruments in days					60 days
Stockholders' Equity Attributable to Parent					$ (8,914,098)	(7,489,515)	(6,569,989)	$ (5,458,180)
Minimum | Office Furniture and Equipment [Member]
Property and equipment, useful life					3 years
Minimum | Software and Hardware [Member]
Property and equipment, useful life					3 years
Minimum | Model Park Improvements and Furnishings [Member]
Property and equipment, useful life					1 year
Maximum | Office Furniture and Equipment [Member]
Property and equipment, useful life					10 years
Maximum | Software and Hardware [Member]
Property and equipment, useful life					5 years
Maximum | Model Park Improvements and Furnishings [Member]
Property and equipment, useful life					5 years
Financial Services
Interest income on mortgage loans					$ 14,200	10,000	9,200
IRLCs
Derivative, Notional Amount					653,200	337,900
Forward contracts
Derivative, Notional Amount					1,000,000	903,000
Whole loan commitments
Derivative, Notional Amount					285,900	310,000
American West Homes [Member] [Member] | Trade Names [Member]
Weighted average useful life (in years)		20 years
Innovative Construction Group [Member]
Business combination, consideration transferred	$ 104,000
Payments to acquire businesses, gross	83,300				$ 10,400	10,400
Goodwill	48,700
Innovative Construction Group [Member] | Trade Names [Member]
Finite-lived intangible assets acquired	$ 1,800
Weighted average useful life (in years)	5 years
Innovative Construction Group [Member] | Customer Relationships [Member]
Finite-lived intangible assets acquired	$ 27,800
Weighted average useful life (in years)	7 years		7 years
JW Homes (Wieland) [Member]
Goodwill						68,900
Restricted stock [Member]
Share-based compensation vesting period					3 years
Retained Earnings
Stockholders' Equity Attributable to Parent					$ (5,581,702)	(4,196,276)	$ (3,306,057)	(2,220,574)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Insurance Receivables, Contract Assets, and Vendor Rebate Receivables recognized					$ 222,900	$ 208,400
Accounting Standards Update 2016-13 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Stockholders' Equity Attributable to Parent								$ 735