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Basis of Presentation (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 01, 2018 USD ($)	Apr. 30, 2019 USD ($) lot	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Payments for business acquisitions					$ (163,724)	$ 0
Customer deposits			$ 333,672		333,672		$ 254,624
Contract asset insurance renewals			34,100		34,100
Residential mortgage loans available-for-sale fair value			383,893		383,893		461,354
Residential mortgage loans available-for-sale aggregate outstanding principal balance			373,100		373,100		444,200
Changes in fair value, gain (loss)			600		(700)	(1,000)
Net gains from the sale of mortgages			36,300	$ 27,800	$ 90,600	83,900
Variability in future cash flows of derivative instruments in days					60 days
Cumulative effect of accounting change				$ 0		22,411
Retained Earnings
Finite-Lived Intangible Assets [Line Items]
Cumulative effect of accounting change	$ 22,400					$ 22,411
Interest rate lock commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount			388,200		$ 388,200		285,000
Forward contracts
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount			523,000		523,000		511,000
Whole loan commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount			$ 209,200		$ 209,200		$ 187,800
American West Homebuilding Operations
Finite-Lived Intangible Assets [Line Items]
Finished lots acquired | lot		1,200
Additional lot option agreements | lot		2,300
American West Homebuilding Operations | Trade Name
Finite-Lived Intangible Assets [Line Items]
Intangible asset acquired		$ 12,000
Intangible asset, amortization period		20 years

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