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Basis of Presentation (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Apr. 30, 2019 USD ($) lot | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Payments for business acquisitions |  |  |  |  | $ (163,724) | $ 0 |
Customer deposits |  |  | $ 334,484 |  | 334,484 |  | $ 254,624
Contract asset insurance renewals |  |  | 32,400 |  | 32,400 |  |
Residential mortgage loans available-for-sale fair value |  |  | 343,732 |  | 343,732 |  | 461,354
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  |  | 331,900 |  | 331,900 |  | 444,200
Changes in fair value, gain (loss) |  |  | (200) |  | (1,300) | (300) |
Net gains from the sale of mortgages |  |  | 30,400 | $ 29,200 | $ 54,300 | $ 56,200 |
Variability in future cash flows of derivative instruments in days |  |  |  |  | 60 days |  |
Cumulative effect of accounting change | $ 22,411 |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 22,411 |  |  |  |  |  |
Interest rate lock commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | 386,000 |  | $ 386,000 |  | 285,000
Forward contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | 577,000 |  | 577,000 |  | 511,000
Whole loan commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 115,200 |  | $ 115,200 |  | $ 187,800
American West Homebuilding Operations |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finished lots acquired | lot |  | 1,200 |  |  |  |  |
Additional lot option agreements | lot |  | 2,300 |  |  |  |  |
American West Homebuilding Operations | Trade Name |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible asset acquired |  | $ 12,000 |  |  |  |  |
Intangible asset, amortization period |  | 20 years |  |  |  |  |

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