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Basis of Presentation (Narrative) (Details) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2016 USD ($) home lot	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items]
Cash paid to acquire business				$ 430,458	$ 0
Antidilutive securities excluded from computation of earnings per share (shares) | shares		2.3	4.2	2.3	4.4
Residential mortgage loans available-for-sale fair value		$ 349,012		$ 349,012		$ 442,715
Residential mortgage loans available-for-sale aggregate outstanding principal balance		335,400		335,400		429,600
Net gain (loss) from change in fair value		(1,000)	$ 1,100	300	$ 300
Net gains from the sale of mortgages		30,100	$ 23,400	$ 77,400	$ 57,200
Variability in future cash flows of derivative instruments in days				60 days
Interest rate lock commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		319,400		$ 319,400		208,200
Forward contracts
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		539,000		539,000		525,000
Whole loan commitments
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount		$ 92,500		$ 92,500		$ 77,600
JW Homes (Wieland)
Finite-Lived Intangible Assets [Line Items]
Cash paid to acquire business	$ 430,500
Number of units in real estate property | lot	7,000
Goodwill	$ 40,400
In Inventory | JW Homes (Wieland)
Finite-Lived Intangible Assets [Line Items]
Number of units in real estate property | home	375
Land Option Contracts | JW Homes (Wieland)
Finite-Lived Intangible Assets [Line Items]
Number of units in real estate property | lot	1,300
Sales Order Backlog | JW Homes (Wieland)
Finite-Lived Intangible Assets [Line Items]
Number of units in real estate property | home	317
Trade Names | JW Homes (Wieland)
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 18,000
Remaining amortization period	20 years

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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