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Supplemental Gas Data (unaudited) - Future Cash Flow of Proved Reserves (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
usd_per_bbl
usd_per_mcf
Dec. 31, 2019
USD ($)
usd_per_mcf
usd_per_bbl
Dec. 31, 2018
USD ($)
usd_per_bbl
usd_per_mcf
Dec. 31, 2017
USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Revenues $ 16,577,563 $ 19,489,588 $ 26,610,100  
Production Costs (6,071,763) (7,903,120) (7,730,451)  
Development Costs (1,957,519) (1,121,073) (1,600,128)  
Income Tax Expense (2,235,205) (2,720,994) (4,147,075)  
Future Net Cash Flows 6,313,076 7,744,401 13,132,446  
Discounted to Present Value at a 10% Annual Rate (3,677,340) (4,673,932) (8,476,989)  
Total Standardized Measure of Discounted Net Cash Flows 2,635,736 $ 3,070,469 $ 4,655,457 $ 3,131,398
Increase in standardized measure of discounted net cash flows 932,000      
Development costs, plugging and abandonment costs 402,174      
Pre-tax discounted basis, plugging and abandonment costs 18,357      
Midstream        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Development costs relating to capital 286,724      
Pre-tax discounted basis, development costs relating to capital $ 231,512      
Natural Gas        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Adjusted oil price (in usd per unit) | usd_per_mcf 1.70 2.24 3.28  
Oil        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Adjusted oil price (in usd per unit) | usd_per_bbl 35.61 44.31 51.68  
NGL        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Adjusted oil price (in usd per unit) | usd_per_bbl 13.18 19.10 27.58