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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | $ 0 |  | $ 0 | $ 12,962 |  |
Gross unrecognized tax benefits | 30,855 |  | 30,855 | 40,300 | $ 30,554 | $ 48,604
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 24,400 |  | 24,400 | 21,600 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 2,800 |  | 2,800 | $ 6,500 |  |
Federal Energy Efficient Home Credit | 24,000 | $ 53,200 | 82,000 |  |  |
Home Closed in Prior Open Tax Year Benefit |  |  | $ 56,800 |  |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
IncomeTaxNetOperatingLossCarryforwardPeriod |  |  | 20 years |  |  |
2019 - 2023 [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 36,400 |  | $ 36,400 |  |  |
2024 - Thereafter [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 147,600 |  | $ 147,600 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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