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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Assets and liabilities measured at fair value on a recurring basis    
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Commodity derivatives, net (a)  
Recurring    
Assets and liabilities measured at fair value on a recurring basis    
Commodity derivatives, net $ 197,918 $ 88,248
Provisionally priced contracts (136,337) (174,079)
Convertible preferred securities 16,278 15,625
Other assets and liabilities 31,191 33,486
Total 109,050 (36,720)
Recurring | Level 1    
Assets and liabilities measured at fair value on a recurring basis    
Commodity derivatives, net 54,516 48,676
Provisionally priced contracts (20,960) (108,736)
Convertible preferred securities 0 0
Other assets and liabilities (209) 5,477
Total 33,347 (54,583)
Recurring | Level 2    
Assets and liabilities measured at fair value on a recurring basis    
Commodity derivatives, net 143,402 39,572
Provisionally priced contracts (115,377) (65,343)
Convertible preferred securities 0 0
Other assets and liabilities 31,400 28,009
Total 59,425 2,238
Recurring | Level 3    
Assets and liabilities measured at fair value on a recurring basis    
Commodity derivatives, net 0 0
Provisionally priced contracts 0 0
Convertible preferred securities 16,278 15,625
Other assets and liabilities 0 0
Total $ 16,278 $ 15,625