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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Taxes    
Earnings before income taxes $ 27,956 $ 57,072
Income tax expense $ 2,345 $ 13,288
Effective tax rate 8.40% 23.30%