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Natural Gas Producing Activities (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2023
Extractive Industries [Abstract]  
Schedule of Cost Incurred Relating to Property Acquisition, Exploration and Development
The following tables present total aggregate capitalized costs and costs incurred related to natural gas, NGLs and oil production activities.
 December 31,
 20232022
 (Thousands)
Capitalized costs
Proved properties$30,471,164 $25,142,857 
Unproved properties2,039,431 1,747,705 
Total capitalized costs32,510,595 26,890,562 
Less: Accumulated depreciation and depletion10,734,099 9,119,553 
Net capitalized costs$21,776,496 $17,771,009 

Years Ended December 31,
202320222021
(Thousands)
Costs incurred (a)
Property acquisition:   
Proved properties (b)$4,142,621 $82,276 $2,544,316 
Unproved properties (c)575,130 113,523 805,942 
Exploration3,330 3,438 24,403 
Development1,782,428 1,298,665 954,580 

(a)Amounts exclude costs for facilities, information technology and other corporate items and include costs for midstream assets.
(b)Amounts in 2023 include $2,522.3 million, $757.6 million and $719.6 million for wells, midstream assets and leases, respectively, acquired in the Tug Hill and XcL Midstream Acquisition described in Note 6. Amounts in 2022 include $40.5 million for leases acquired in the 2022 Asset Acquisition. Amounts in 2021 include $1,754.7 million, $257.9 million and $450.0 million for wells, midstream assets and leases, respectively, acquired in the Alta Acquisition and Reliance Asset Acquisition described in Note 6.
(c)Amounts in 2023 include $523.0 million for unproved properties acquired in the Tug Hill and XcL Midstream Acquisition. Amounts in 2022 include $17.1 million for unproved properties acquired in the 2022 Asset Acquisition. Amounts in 2021 include $743.3 million for unproved properties acquired in the Alta Acquisition.
Results of Operations Related to Natural Gas, NGL and Oil Producing Activities
The following table presents the results of operations related to natural gas, NGLs and oil production.
 Years Ended December 31,
 202320222021
 (Thousands)
Sales of natural gas, NGLs and oil$5,044,768 $12,114,168 $6,804,020 
Transportation and processing2,157,260 2,116,976 1,942,165 
Production254,700 300,985 225,279 
Exploration3,330 3,438 24,403 
Depreciation and depletion1,732,142 1,665,962 1,676,702 
Loss (gain) on sale/exchange of long-lived assets17,445 (8,446)(21,124)
Impairment and expiration of leases109,421 176,606 311,835 
Income tax expense187,463 1,987,323 667,435 
Results of operations from producing activities, excluding corporate overhead$583,007 $5,871,324 $1,977,325 
Schedule of the Entity's Proved Reserves
For all tables presented, NGLs and oil were converted at a rate of one Mbbl to approximately six million cubic feet (MMcf).
 Years Ended December 31,
 202320222021
 (MMcf)
Natural gas, NGLs and oil   
Proved developed and undeveloped reserves:   
Balance at January 125,002,589 24,961,499 19,802,092 
Revision of previous estimates(1,402,039)(654,618)(274,111)
Purchase of hydrocarbons in place2,600,667 141,038 4,186,933 
Extensions, discoveries and other additions3,411,750 2,494,713 3,104,402 
Production(2,016,273)(1,940,043)(1,857,817)
Balance at December 3127,596,694 25,002,589 24,961,499 
Proved developed reserves:
Balance at January 117,513,645 17,218,655 13,641,345 
Balance at December 3119,558,176 17,513,645 17,218,655 
Proved undeveloped reserves:
Balance at January 17,488,944 7,742,844 6,160,747 
Balance at December 318,038,518 7,488,944 7,742,844 
 Years Ended December 31,
 202320222021
 (MMcf)
Natural gas   
Proved developed and undeveloped reserves:   
Balance at January 123,824,887 23,523,665 18,865,013 
Revision of previous estimates(1,461,305)(432,315)(568,814)
Purchase of natural gas in place2,012,159 141,038 4,186,933 
Extensions, discoveries and other additions3,326,736 2,434,543 2,786,850 
Production(1,907,343)(1,842,044)(1,746,317)
Balance at December 3125,795,134 23,824,887 23,523,665 
Proved developed reserves:   
Balance at January 116,541,017 16,152,083 12,750,312 
Balance at December 3118,186,432 16,541,017 16,152,083 
Proved undeveloped reserves:
Balance at January 17,283,870 7,371,582 6,114,701 
Balance at December 317,608,702 7,283,870 7,371,582 
 Years Ended December 31,
202320222021
(Mbbl)
NGLs   
Proved developed and undeveloped reserves:   
Balance at January 1186,141 225,792 148,762 
Revision of previous estimates11,558 (33,955)46,868 
Purchase of NGLs in place90,604 — — 
Extensions, discoveries and other additions13,592 9,610 47,120 
Production(16,550)(15,306)(16,958)
Balance at December 31285,345 186,141 225,792 
Proved developed reserves:  
Balance at January 1154,921 169,781 141,489 
Balance at December 31218,523 154,921 169,781 
Proved undeveloped reserves:
Balance at January 131,220 56,011 7,273 
Balance at December 3166,822 31,220 56,011 
 Years Ended December 31,
 202320222021
 (Mbbl)
Oil   
Proved developed and undeveloped reserves:   
Balance at January 110,142 13,846 7,417 
Revision of previous estimates(1,680)(3,095)2,249 
Purchase of oil in place7,481 — — 
Extensions, discoveries and other additions577 418 5,805 
Production(1,605)(1,027)(1,625)
Balance at December 3114,915 10,142 13,846 
Proved developed reserves:   
Balance at January 17,183 7,981 7,016 
Balance at December 3110,101 7,183 7,981 
Proved undeveloped reserves:
Balance at January 12,959 5,865 401 
Balance at December 314,814 2,959 5,865 
Schedule of Estimated Future Net Cash Flows From Natural Gas and Oil Reserves
The following table summarizes estimated future net cash flows from natural gas and oil reserves.
December 31,
 202320222021
 (Thousands)
Future cash inflows (a)$52,916,665 $140,032,653 $70,844,136 
Future production costs (b)(24,357,033)(22,801,652)(20,961,576)
Future development costs(4,298,372)(3,244,211)(2,882,921)
Future income tax expenses(5,230,629)(26,375,241)(10,433,091)
Future net cash flow19,030,631 87,611,549 36,566,548 
10% annual discount for estimated timing of cash flows(9,768,282)(47,547,025)(19,285,424)
Standardized measure of discounted future net cash flows$9,262,349 $40,064,524 $17,281,124 

(a)The majority of the Company's production is sold through liquid trading points on interstate pipelines. Reserves were computed using average first-day-of-the-month closing prices for the prior twelve months less regional adjustments. Regional adjustments were calculated using historical average realized prices received in the Appalachian Basin. NGLs pricing was calculated using average first-day-of-the-month closing prices for the prior twelve months for NGLs components, adjusted using the regional component makeup of proved NGLs.
December 31,
202320222021
Oil for West Texas Intermediate (WTI) ($/Bbl)$78.21 $94.14 $66.55 
Less regional adjustments ($/Bbl)14.35 17.31 14.98 
Oil price ($/Bbl)63.86 76.83 51.57 
Natural gas for NYMEX ($/MMBtu)2.637 6.357 3.598 
Less regional adjustments ($/MMBtu)1.029 1.094 1.040 
Natural gas price ($/Mcf)1.700 5.543 2.694 
NGLs price ($/Bbl)28.44 38.66 29.95 

(b)Includes approximately $2,443 million, $2,098 million and $1,937 million for future plugging and abandonment costs as of December 31, 2023, 2022 and 2021, respectively.
Schedule of Changes in The Standardized Measure of Discounted Net Cash Flows From Natural Gas and Oil Reserves
The following table summarizes the changes in the standardized measure of discounted future net cash flows.    
Years Ended December 31,
 202320222021
 (Thousands)
Net sales and transfers of natural gas and oil produced$(2,632,808)$(9,696,207)$(4,636,576)
Net changes in prices, production and development costs(48,739,248)35,353,172 17,290,913 
Extensions, discoveries and improved recovery, net of related costs6,347,387 1,798,851 46,078 
Development costs incurred1,296,380 902,925 764,002 
Net purchase of minerals in place2,131,567 280,233 3,491,441 
Revisions of previous quantity estimates(2,768,922)(299,423)184,552 
Accretion of discount4,006,452 1,728,112 336,646 
Net change in income taxes9,190,460 (7,233,051)(3,614,029)
Timing and other366,557 (51,212)51,639 
Net (decrease) increase(30,802,175)22,783,400 13,914,666 
Balance at January 140,064,524 17,281,124 3,366,458 
Balance at December 31$9,262,349 $40,064,524 $17,281,124