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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, 2024
USD ($)
Mcfe
well
Mcf
bbl
Dec. 31, 2023
USD ($)
Mcfe
Mcf
bbl
Dec. 31, 2022
USD ($)
Mcfe
bbl
Mcf
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Beginning balance (energy) 8,740,742 9,806,890 9,625,730
Revisions (energy) (624,896) (454,409) (387,320)
Price changes (energy) (280,692) (465,314) 24,904
Extensions and Discoveries (energy) 1,276,018 582,229 1,123,745
Production (MMcfe) (550,814) (560,366) (580,169)
Sales of Reserves In-Place (MMcfe) (22,415) (168,288)  
Ending balance (energy) 8,537,943 8,740,742 9,806,890
Proved developed resources (energy) 6,099,654 6,027,762 6,221,422
Proved undeveloped resources (energy) 2,438,289 2,712,980 3,585,468
Period from reserves booking for proved undeveloped locations to be fully developed 5 years 5 years 5 years
Downward revision for acreage consolidation (energy)   169,000  
Downward revision due to plan changes (energy)   710,000 24,000
Performance revision associated with proved developed producing assets (energy)   467,000  
Revision due to mining and performance   43,000  
Revision for fallen wells   146,000  
Proved and unproved resources, extensions and discoveries (energy)   42,000 23,000
Capital Expenditures | $ $ 540,332 $ 679,404 $ 565,754
Reserves reported for more than five years 312,000    
Shale      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Downward revision for acreage consolidation (energy)     298,000
Downward revision due to plan changes (energy)     66,000
Southwest Pennsylvania and West Virginia      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 522,000    
Number of dry gas wells added | well 22    
Central Pennsylvania and Southwest Pennsylvania      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Proved and unproved resources, extensions and discoveries (energy) 502,000    
Number of dry gas wells added | well 40    
Natural Gas      
Oil and Gas, Proved Reserve, Quantity, Volume [Roll Forward]      
Beginning balance (volume) | Mcf 7,922,992 9,187,278 8,987,807
Revisions (volume) | Mcf (634,288) (698,397) (339,878)
Price Changes (volume) | Mcf (237,036) (382,311) 24,795
Extension and Discoveries (volume) | Mcf 1,092,556 478,026 1,055,250
Production (volume) | Mcf (496,922) (514,668) (540,696)
Sales of Reserves In-Place (volume) | Mcf (18,377) (146,936)  
Ending balance (volume) | Mcf 7,628,925 7,922,992 9,187,278
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Proved developed resources (volume) | Mcf 5,418,858 5,521,437 5,788,814
Proved undeveloped resources (volume) | Mcf 2,210,067 2,401,555 3,398,464
NGLs      
Oil and Gas, Proved Reserve, Quantity, Volume [Roll Forward]      
Beginning balance (volume) | bbl 134,711 100,153 102,285
Revisions (volume) | bbl 1,921 41,119 (6,140)
Price Changes (volume) | bbl (6,707) (12,733) 17
Extension and Discoveries (volume) | bbl 30,465 16,778 10,324
Production (volume) | bbl (8,825) (7,410) (6,333)
Sales of Reserves In-Place (volume) | bbl (644) (3,196)  
Ending balance (volume) | bbl 150,921 134,711 100,153
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Proved developed resources (volume) | bbl 112,884 83,682 70,063
Proved undeveloped resources (volume) | bbl 38,037 51,029 30,090
Condensate & Crude Oil      
Oil and Gas, Proved Reserve, Quantity, Volume [Roll Forward]      
Beginning balance (volume) | bbl 1,581 3,115 4,036
Revisions (volume) | bbl (356) (453) (1,768)
Price Changes (volume) | bbl (569) (1,101) 1
Extension and Discoveries (volume) | bbl 112 589 1,092
Production (volume) | bbl (157) (206) (246)
Sales of Reserves In-Place (volume) | bbl (29) (363)  
Ending balance (volume) | bbl 582 1,581 3,115
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Proved developed resources (volume) | bbl 582 706 2,038
Proved undeveloped resources (volume) | bbl 0 875 1,077
Proved Undeveloped      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Beginning balance (energy) 2,712,980    
Undeveloped Reserves Transferred to Developed (energy) (555,964)    
Extensions and Discoveries (energy) 1,024,237    
Ending balance (energy) 2,438,289 2,712,980  
Capital Expenditures | $ $ 224,394    
Proved Undeveloped | Price Revisions      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Revisions (energy) (226,829)    
Proved Undeveloped | Revisions Due to Plan Changes      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Revisions (energy) (189,167)    
Proved Undeveloped | Revisions Due to Changes Related to Well Performance      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Revisions (energy) (43,030)    
Proved Undeveloped | Revisions Due to 5 Year Rule      
Oil and Gas, Proved Reserve, Quantity, Energy [Roll Forward]      
Revisions (energy) (283,938)