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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 ($) home lot | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($) shares | May 03, 2017 lot | Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cash paid to acquire business |  |  |  | $ 0 | $ 430,025 |  |
Number of units in real estate property | lot |  |  |  |  |  | 4,600 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  | 0.1 | 2.3 |  |
Residential mortgage loans available-for-sale fair value |  | $ 364,939 |  | $ 364,939 |  |  | $ 539,496
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  | 353,300 |  | 353,300 |  |  | 529,700
Net gain (loss) from change in fair value |  | (2,200) | $ 400 | (4,100) | $ 1,300 |  |
Net gains from the sale of mortgages |  | $ 27,700 | $ 25,800 | $ 52,900 | $ 47,300 |  |
Variability in future cash flows of derivative instruments in days |  |  |  | 75 days |  |  |
Income statement impact ASU 2016-09 adoption |  | 3.7 |  |  |  |  |
Interest rate lock commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | $ 371,600 |  | $ 371,600 |  |  | 273,900
Forward contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | 576,000 |  | 576,000 |  |  | 610,000
Whole loan commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | $ 115,200 |  | $ 115,200 |  |  | 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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