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Basis of Presentation (Narrative) (Details) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2016 USD ($) home lot	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) shares	Dec. 31, 2015 USD ($)
Cash paid to acquire business				$ 430,025	$ 0
Antidilutive securities excluded from computation of earnings per share (shares) | shares		2.3	4.3		4.5
Residential mortgage loans available-for-sale fair value		$ 364,004		364,004		$ 442,715
Residential mortgage loans available-for-sale aggregate outstanding principal balance		348,700		348,700		429,600
Net gain (loss) from change in fair value		400	$ (900)	1,300	$ (800)
Net gains from the sale of mortgages		25,800	$ 17,600	$ 47,300	$ 33,800
Variability in future cash flows of derivative instruments in days				60 days
Interest rate lock commitments
Derivative, notional amount		320,800		$ 320,800		208,200
Forward contracts
Derivative, notional amount		574,000		574,000		525,000
Whole loan commitments
Derivative, notional amount		$ 65,600		$ 65,600		$ 77,600
JW Homes (Wieland)
Cash paid to acquire business	$ 430,000
Number of units in real estate property | lot	7,000
Goodwill	$ 40,100
In Inventory | JW Homes (Wieland)
Number of units in real estate property | home	375
Land Option Contracts | JW Homes (Wieland)
Number of units in real estate property | lot	1,300
Sales Order Backlog | JW Homes (Wieland)
Number of units in real estate property | home	317
Trade Names | JW Homes (Wieland)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 18,000
Finite-Lived Intangible Assets, 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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-Section 13
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