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Income Taxes (Tables)
9 Months Ended
Aug. 31, 2019
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 tax rates were as follows (dollars in thousands):
 
Three Months Ended August 31,
 
Nine Months Ended August 31,
 
2019
 
2018
 
2019
 
2018
Income tax expense
$
23,800

 
$
27,200

 
$
37,600

 
$
165,500

Effective tax rate
25.9
%
 
23.7
%
 
20.5
%
 
69.2
%