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Income Taxes (Tables)
3 Months Ended
Feb. 28, 2017
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Benefit (Provision) and Effective Tax Rate The provision for income taxes and effective tax rate were as follows:
 
Three Months Ended
 
February 28,
 
February 29,
(Dollars in thousands)
2017
 
2016
Provision for income taxes
$
(19,969
)
 
(56,241
)
Effective tax rate (1)
34.40
%
 
28.08
%
(1)
For the three months ended February 28, 2017, the effective tax rate included tax benefits for the domestic production activities deduction and energy tax credits, offset primarily by state income tax expense. For the three months ended February 29, 2016, the effective tax rate included tax benefits for (1) a settlement with the IRS, (2) the domestic production activities deduction, and (3) energy tax credits, offset primarily by state income tax expense.