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Income Taxes Income Taxes (Tables) | 6 Months Ended
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May 31, 2017
Income Tax Disclosure [Abstract] |
Income tax benefit computed at the statutory U.S federal income tax rate and income tax benefit (expense) provided in the consolidated statements of operations | Our income tax expense and effective income tax rates were as follows (dollars in thousands):
| Three Months Ended May 31, |  | Six Months Ended May 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Income tax expense (a) | $ | 20,200 |  |  | $ | 9,200 |  |  | $ | 27,400 |  |  | $ | 12,100 |
Effective income tax rate (a) | 38.9 | % |  | 37.1 | % |  | 37.3 | % |  | 29.6 | %
(a) | Amounts reflect the favorable net impact of federal energy tax credits we earned from building energy-efficient homes. The net impact of these tax credits was $.1 million and $.4 million for the three months ended May 31, 2017 and 2016, respectively, and $1.2 million and $3.7 million for the six months ended May 31, 2017 and 2016, respectively.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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