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Basis of Presentation (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Apr. 30, 2019 USD ($) lot | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Payments for business acquisitions |  |  |  |  | $ (163,724) | $ 0 |
Customer deposits |  |  | $ 333,672 |  | 333,672 |  | $ 254,624
Contract asset insurance renewals |  |  | 34,100 |  | 34,100 |  |
Residential mortgage loans available-for-sale fair value |  |  | 383,893 |  | 383,893 |  | 461,354
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  |  | 373,100 |  | 373,100 |  | 444,200
Changes in fair value, gain (loss) |  |  | 600 |  | (700) | (1,000) |
Net gains from the sale of mortgages |  |  | 36,300 | $ 27,800 | $ 90,600 | 83,900 |
Variability in future cash flows of derivative instruments in days |  |  |  |  | 60 days |  |
Cumulative effect of accounting change |  |  |  | $ 0 |  | 22,411 |
Retained Earnings |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 22,400 |  |  |  |  | $ 22,411 |
Interest rate lock commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | 388,200 |  | $ 388,200 |  | 285,000
Forward contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | 523,000 |  | 523,000 |  | 511,000
Whole loan commitments |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 209,200 |  | $ 209,200 |  | $ 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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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21310-158488 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21286-158488 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337389&loc=d3e21493-158490 + Details
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