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Supplemental Gas Data (unaudited) - Proved Undeveloped Reserves (Details)
bbl in Thousands, Mcfe in Thousands, Mcf in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Mcfe
well
bbl
Mcf
Dec. 31, 2022
USD ($)
Mcfe
Mcf
bbl
Dec. 31, 2021
USD ($)
Mcfe
Mcf
bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Beginning balance (energy) 9,806,890 9,625,730 9,549,758
Revisions (energy) (454,409) (387,320) (327,050)
Price changes (energy) (465,314) 24,904 86,532
Extensions and Discoveries (energy) 582,229 1,123,745 906,738
Production (MMcfe) (560,366) (580,169) (590,248)
Sales of Reserves In-Place (MMcfe) (168,288)    
Ending balance (energy) 8,740,742 9,806,890 9,625,730
Proved developed resources (energy) 6,027,762 6,221,422 5,905,611
Proved undeveloped resources (energy) 2,712,980 3,585,468 3,720,119
Downward revision due to plan changes (energy) 710,000 24,000 356,000
Upward revision from increased performance (energy) 467,000   331,000
Proved and unproved resources, extensions and discoveries (energy) 42,000 23,000 26,000
Downward revision for acreage consolidation (energy) 169,000   267,000
Downward revision due to 5 year rule (energy)     60,000
Revision due to mining and performance 43,000    
Performance revision associated with proved developed producing assets (energy) 467,000   46,000
Revision for fallen wells 146,000    
Capital spent related to undeveloped reserves transferred to developed | $ $ 679,404 $ 565,754 $ 465,861
Downward revision due to risk in well development (energy)     20,000
Reserves reported for more than five years 290,000    
Utica | Central Pennsylvania and Southwest Pennsylvania      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 204,000    
Number of dry gas wells added | well 9    
Marcellus | Southwest Pennsylvania and West Virginia      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 336,000    
Number of dry gas wells added | well 16    
Shale      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Downward revision due to plan changes (energy)   66,000  
Downward revision for acreage consolidation (energy)   298,000  
Natural Gas      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | Mcf 9,187,278 8,987,807 9,034,066
Revisions (volume) | Mcf (698,397) (339,878) (409,215)
Price Changes (volume) | Mcf (382,311) 24,795 82,248
Extension and Discoveries (volume) | Mcf 478,026 1,055,250 832,696
Production (volume) | Mcf (514,668) (540,696) (551,988)
Sales of Reserves In-Place (volume) | Mcf (146,936)    
Ending balance (volume) | Mcf 7,922,992 9,187,278 8,987,807
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | Mcf 5,521,437 5,788,814 5,569,332
Proved undeveloped resources (volume) | Mcf 2,401,555 3,398,464 3,418,475
NGLs      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | bbl 100,153 102,285 81,867
Revisions (volume) | bbl 41,119 (6,140) 13,655
Price Changes (volume) | bbl (12,733) 17 692
Extension and Discoveries (volume) | bbl 16,778 10,324 12,047
Production (volume) | bbl (7,410) (6,333) (5,976)
Sales of Reserves In-Place (volume) | bbl (3,196)    
Ending balance (volume) | bbl 134,711 100,153 102,285
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | bbl 83,682 70,063 53,204
Proved undeveloped resources (volume) | bbl 51,029 30,090 49,081
Condensate & Crude Oil      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Beginning balance (volume) | bbl 3,115 4,036 4,081
Revisions (volume) | bbl (453) (1,768) 39
Price Changes (volume) | bbl (1,101) 1 22
Extension and Discoveries (volume) | bbl 589 1,092 294
Production (volume) | bbl (206) (246) (400)
Sales of Reserves In-Place (volume) | bbl (363)    
Ending balance (volume) | bbl 1,581 3,115 4,036
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved developed resources (volume) | bbl 706 2,038 2,843
Proved undeveloped resources (volume) | bbl 875 1,077 1,193
Proved Undeveloped      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Beginning balance (energy) 3,585,468    
Undeveloped Reserves Transferred to Developed (energy) (819,365)    
Extensions and Discoveries (energy) 540,345    
Ending balance (energy) 2,712,980 3,585,468  
Capital spent related to undeveloped reserves transferred to developed | $ $ 319,475    
Proved Undeveloped | Price Revisions      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (181,837)    
Proved Undeveloped | Revisions Due to Plan Changes      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (168,800)    
Proved Undeveloped | Revisions Due to Changes Related to Well Performance      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) 466,730    
Proved Undeveloped | Revisions Due to 5 Year Rule      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Revisions (energy) (709,561)