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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Sep. 30, 2023
Summary Of Significant Accounting Policies [Line Items]        
Gas Stored Underground $ 23,780   $ 32,364  
Capitalized Costs Oil and Gas Producing Activities Net 2,100,000   1,900,000  
Capitalized costs of unproved properties excluded from amortization $ 67,500   66,000  
Full cost ceiling test discount factor 10.00%      
Amount Full Cost Ceiling Exceeds Book Value Of Oil And Gas Properties $ 3,300,000      
Decrease estimated future net cash flows $ (954,300)      
Antidilutive securities 1,987 8,732    
Reserve For Gas Replacement [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Gas Stored Underground $ 17,695   $ 0  
Restricted Stock Units [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Share based compensation other than options grants in period 115,073      
Granted in fiscal year, weighted average grant date fair value $ 59.69      
Performance Shares [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Share based compensation other than options grants in period 202,259      
Granted in fiscal year, weighted average grant date fair value $ 64.28      
Subsequent Event [Member] | Reserve For Gas Replacement [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Gas Stored Underground       $ 0