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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Summary Of Significant Accounting Policies [Line Items]    
Prepayments $ 8,727 $ 10,743
Prepaid Property and Other Taxes 15,143 13,709
Fair Values of Firm Commitments 16,618 15,775
Regulatory Assets 18,537 20,438
Other Current Assets 66,145 60,665
Federal [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Income Taxes Receivable $ 7,120 $ 0