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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2016
Jun. 13, 2016
Dec. 01, 2015
Summary Of Significant Accounting Policies [Line Items]                    
Reclassification of Current Assets             $ 137,200      
Gas stored underground $ (15,944)       $ (15,944)   (34,252)      
Capitalized costs of unproved properties excluded from amortization         $ 130,900   176,300      
Full cost ceiling test discount factor 10.00%       10.00%          
Impairment of Oil and Gas Producing Properties $ 82,658     $ 588,712 $ 915,552 $ 709,060        
Increase estimated future net cash flows $ 262,900 $ 252,100 $ 253,700              
Net Proceeds from Sale of Oil and Gas Producing Properties         $ 115,235 $ 0        
Antidilutive securities 346,090     180,065 414,092 2,948        
Receivable from Sale of Oil and Gas Producing Properties         $ 22,081 $ 0        
Liabilities Settled         66,756          
Upper Devonian Wells [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Liabilities Settled         58,400          
Reserve For Gas Replacement [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Gas stored underground $ 6,490       6,490   $ 0      
IOG-CRV Marcellus, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Partner Working Interest In Joint Wells                   80.00%
Internal Rate of Return                   15.00%
Seneca [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Net Proceeds from Sale of Oil and Gas Producing Properties         115,200          
Receivable from Sale of Oil and Gas Producing Properties         22,100          
Reduction in Property, Plant and Equipment 137,300       137,300          
Impairment of Oil and Gas Producing Properties [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Deferred Income Tax Benefit $ 34,800       $ 384,600          
Stock Options [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Stock options granted         0          
Restricted Shares [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Share based compensation other than options grants in period         0          
Stock Appreciation Right [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Share based compensation other than options grants in period         0          
Non-performance Based Restricted Stock Units [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Share based compensation other than options grants in period         99,843          
Granted in fiscal year, weighted average grant date fair value         $ 35.57          
Performance Shares [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Share based compensation other than options grants in period         309,996          
Granted in fiscal year, weighted average grant date fair value         $ 30.71          
Subsequent Event [Member] | Reserve For Gas Replacement [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Gas stored underground               $ 0    
Maximum [Member] | IOG-CRV Marcellus, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                 82  
Initial Participation [Member] | IOG-CRV Marcellus, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                   42
26 Percent Net Revenue Interest [Member] | Seneca [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                 56  
Additional Option to Participate [Member] | IOG-CRV Marcellus, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                 7  
After Internal Rate of Return Achieved [Member] | Seneca [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Partner Working Interest In Joint Wells                   85.00%
Extended Agreement [Member] | IOG-CRV Marcellus, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                 75  
Partner Commitment to Develop Joint Wells                 $ 325,000  
Extended Agreement [Member] | Seneca [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Partner Working and Net Revenue Interest                 20.00%  
Royalty Interest                 7.50%  
Partner Working Interest In Joint Wells                 20.00%  
Partner Net Revenue Interest in Joint Wells                 26.00%  
20 Percent Net Revenue Interest [Member] | Seneca [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Wells to be Developed                 19