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Income Taxes
 3 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
 
The components of federal and state income taxes included in the Consolidated Statements of Income are as follows (in thousands): 
                                                         
Three Months Ended 
 December 31,
                                                         
2016
 
2015
Current Income Taxes 
 

 
 

Federal                                              
$
8,245

 
$
(8,227
)
State                                                  
3,335

 
3,890

 
 
 
 
Deferred Income Taxes                                
 

 
 

Federal                                               
36,418

 
(97,705
)
State                                                    
8,434

 
(42,308
)
 
56,432

 
(144,350
)
Deferred Investment Tax Credit                            
(43
)
 
(87
)
 
 
 
 
Total Income Taxes                                      
$
56,389

 
$
(144,437
)
Presented as Follows:
 

 
 

Other Income
(43
)
 
(87
)
Income Tax Expense (Benefit)
56,432

 
(144,350
)
 
 
 
 
Total Income Taxes
$
56,389

 
$
(144,437
)


Total income taxes as reported differ from the amounts that were computed by applying the federal income tax rate to income (loss) before income taxes.  The following is a reconciliation of this difference (in thousands): 
 
Three Months Ended 
 December 31,
 
2016
 
2015
U.S. Income (Loss) Before Income Taxes
$
145,297

 
$
(333,546
)
 
 

 
 

Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35%
$
50,854

 
$
(116,741
)
State Income Taxes (Benefit)
7,650

 
(24,972
)
Miscellaneous
(2,115
)
 
(2,724
)
 
 
 
 
Total Income Taxes
$
56,389

 
$
(144,437
)