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Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - Commodity - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Derivatives, Fair Value [Line Items]      
Commodity derivative assets $ 169,124 $ 210,919 $ 319,554
Commodity derivative liabilities (179,916) (147,110) (235,825)
Cash collateral paid 49,341    
Cash collateral paid   24,439 16,121
Total 38,549 88,248 99,850
Commodity Derivative Assets - Current      
Derivatives, Fair Value [Line Items]      
Commodity derivative assets 154,042 201,542 301,990
Commodity derivative liabilities (81,057) (47,898) (78,516)
Cash collateral paid 49,341    
Cash collateral paid   24,439 16,121
Derivative assets 122,326 178,083 239,595
Commodity Derivative Assets - Noncurrent      
Derivatives, Fair Value [Line Items]      
Commodity derivative assets 3,656 1,496 4,730
Commodity derivative liabilities (96) (64) (396)
Cash collateral paid 0    
Cash collateral paid   0 0
Derivative assets 3,560 1,432 4,334
Commodity Derivative Liabilities - Current      
Derivatives, Fair Value [Line Items]      
Commodity derivative assets 11,207 7,868 12,733
Commodity derivative liabilities (96,847) (98,717) (155,244)
Cash collateral paid 0    
Cash collateral paid   0 0
Derivative Liability (85,640) (90,849) (142,511)
Commodity Derivative Liabilities - Noncurrent      
Derivatives, Fair Value [Line Items]      
Commodity derivative assets 219 13 101
Commodity derivative liabilities (1,916) (431) (1,669)
Cash collateral paid 0    
Cash collateral paid   0 0
Derivative Liability $ (1,697) $ (418) $ (1,568)