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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financial Assets:    
Pretax impairment charges for proved oil and gas properties and other assets for firm commitment contracts   $ 152,000
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]    
Proved oil and gas properties, other property, plant and equipment and other assets, carrying amount $ 1,587,000 998,000
Proved oil and gas properties, other property, plant and equipment and other assets written down during the period - fair value at end of period 319,000 701,000
Pretax impairment charge for a commodity price-related write-down of other assets 72,000 90,000
Pretax impairment charges for proved oil and gas properties, other property, plant and equipment and other assets 1,268,000 297,000
Debt Disclosure [Abstract]    
Aggregate Principal Amount of Current and Long-Term Debt 5,640,000 5,140,000
Debt Instrument, Fair Value Disclosure 6,505,000 5,452,000
Assets From Price Risk Management Activities [Member]    
Financial Assets:    
Assets, Fair Value Disclosure 65,000 1,000
Liabilities From Price Risk Management Activities [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure   20,000
Other Liabilities    
Financial Assets:    
Liabilities, Fair Value Disclosure 1,000  
Other Assets    
Financial Assets:    
Assets, Fair Value Disclosure 1,000  
Commodity Contract [Member] | Crude Oil | Price Swaps    
Financial Assets:    
Liabilities, Fair Value Disclosure   23,266
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure   23,266
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure   0
Commodity Contract [Member] | Crude Oil | Roll Differential Swap    
Financial Assets:    
Liabilities, Fair Value Disclosure 897  
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure 0  
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure 897  
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Liabilities, Fair Value Disclosure 0  
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps    
Financial Assets:    
Assets, Fair Value Disclosure   3,401
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   3,401
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas | Price Swaps    
Financial Assets:    
Assets, Fair Value Disclosure 66,064  
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure 0  
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure 66,064  
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure $ 0  
Commodity Contract [Member] | Natural Gas | Basis Swaps [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   970
Commodity Contract [Member] | Natural Gas | Basis Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   0
Commodity Contract [Member] | Natural Gas | Basis Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   970
Commodity Contract [Member] | Natural Gas | Basis Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Assets, Fair Value Disclosure   $ 0