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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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