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Acquisitions and Divestitures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 22, 2021
Feb. 05, 2021
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Assets and Liabilities Held for Sale [Line Items]            
Proceeds from sale of assets         $ 448 $ 38,086
Royalty Interest Of Sand Ridge Mississippian Trust I            
Assets and Liabilities Held for Sale [Line Items]            
Gross purchase price $ 4,900          
Net purchase price $ 3,600          
Royalty Interest Of Sand Ridge Mississippian Trust I | Sand Ridge Energy Inc            
Assets and Liabilities Held for Sale [Line Items]            
Ownership interest in trust 26.90%          
Disposal Group, Held-for-sale, Not Discontinued Operations | North Park Basin, Colorado            
Assets and Liabilities Held for Sale [Line Items]            
Purchase price   $ 47,000        
Proceeds from sale of assets   38,900        
Closing adjustments   8,100        
Reduction of full cost pool assets   22,000        
Reduction in non-full cost pool assets   4,600        
Gain on sale   18,900   $ 19,700    
Decrease in sales price     $ 800      
Gain from release of revenues in suspense   500        
Gain from relief of asset retirement obligations   6,100        
Reduction in oil and gas properties related to NPB   $ 26,600