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Income Taxes Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Components of income tax expense [Line Items]        
Current Income Tax Expense (Benefit) $ (1,923) $ 1,411 $ (3,206) $ 1,658
Deferred income taxes 27,586 224 27,928 2,214
Income Tax Expense 25,663 1,635 24,722 3,872
UNITED STATES        
Components of income tax expense [Line Items]        
Current Income Tax Expense (Benefit) (1,956) 1,152 (3,376) 1,101
Deferred income taxes 24,438 162 24,876 2,051
State and Local Jurisdiction [Member]        
Components of income tax expense [Line Items]        
Current Income Tax Expense (Benefit) 33 259 170 557
Deferred income taxes $ 3,148 $ 62 $ 3,052 $ 163