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Income Taxes Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Unrecognized Tax Benefits Decrease     $ 2,600  
Income Tax Expense (Benefit) $ (116,030) $ 5,136 (260,380) $ 60,296
Settlement with Taxing Authority [Member]        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income Tax Expense (Benefit)     $ (500)