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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 ($) home lot | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | May 03, 2017 lot | Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  | $ 0 | $ 430,458 |  |
Number of units in real estate property | lot |  |  |  |  |  | 4,600 |
Antidilutive securities excluded from computation of earnings per share | shares |  | 0.1 | 2.3 | 0.1 | 2.3 |  |
Residential mortgage loans available-for-sale fair value |  | $ 364,734 |  | $ 364,734 |  |  | $ 539,496
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  | 352,700 |  | 352,700 |  |  | 529,700
Net gain (loss) from change in fair value |  | 700 | $ (1,000) | (3,400) | $ 300 |  |
Net gains from the sale of mortgages |  | $ 27,100 | $ 30,100 | $ 80,100 | $ 77,400 |  |
Variability in future cash flows of derivative instruments in days |  |  |  | 60 days |  |  |
Income statement impact ASU 2016-09 adoption |  | 5.4 |  |  |  |  |
Interest rate lock commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | $ 346,600 |  | $ 346,600 |  |  | 273,900
Forward contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | 532,000 |  | 532,000 |  |  | 610,000
Whole loan commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | $ 137,800 |  | $ 137,800 |  |  | 157,600
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 |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect | Retained Earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  |  | 18,600
Deferred income tax assets, net |  |  |  |  |  |  | $ 18,600

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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