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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes    
Earnings before income taxes $ 61,515 $ 37,487
Income tax expense $ 12,395 $ 19,227
Effective tax rate 20.10% 51.30%