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Risk Management Activities (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
MMBTU
$ / bbl
$ / MMBTU
bbl
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]    
Document Period End Date Mar. 31, 2020  
Assets from Price Risk Management Activities $ 932,928,000 $ 1,299,000
Liabilities from Price Risk Management Activities 0 20,194,000
Derivative Collateral [Abstract]    
Collateral Had on Derivative 0 0
Collateral Held on Derivative 762,000,000 0
Assets From Price Risk Management Activities    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities 941,000,000 3,000,000
Liabilities from Price Risk Management Activities 8,000,000 2,000,000
Assets From Price Risk Management Activities | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities 932,928,000 1,299,000
Liabilities From Price Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Assets from Price Risk Management Activities   3,000,000
Liabilities from Price Risk Management Activities   23,000,000
Liabilities From Price Risk Management Activities [Member] | Price Risk Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities from Price Risk Management Activities $ 0 $ 20,194,000
Crude Oil | Derivative Contracts - May [Member] | Houston Differential Basis Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 10,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 1.55  
Crude Oil | Derivative Contracts - May [Member] | ICE Brent Differential Basis Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 10,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 4.92  
Crude Oil | Derivative Contracts - February through April (closed) [Member] | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 10,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 0.70  
Crude Oil | Derivative Contracts - April through June [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 265,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 51.36  
Crude Oil | Derivative Contracts - May [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 200,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 59.33  
Crude Oil | Derivative Contracts - July [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 207,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 44.94  
Crude Oil | Derivative Contracts - August through September [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 107,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 58.94  
Crude Oil | Derivative Contracts - May through December [Member] | Roll Differential Swap    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 10,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 0.70  
Natural Gas Liquids | Derivative Contracts - January through February [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 4,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 21.34  
Natural Gas Liquids | Derivative Contracts - March (closed) [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 25,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 17.92  
Natural Gas Liquids | Derivative Contracts - April through December [Member] | Price Swaps    
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 25,000  
Derivative, Swap Type, Average Fixed Price | $ / bbl 17.92  
Natural Gas | Derivative Contracts - January through December (closed) [Member] | HSC Differential Basis Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.05  
Volume (MMBtud) | MMBTU 60,000  
Natural Gas | Derivative Contracts - January through March (closed) [Member] | HSC Differential Basis Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.05  
Volume (MMBtud) | MMBTU 60,000  
Cash Paid For Early Termination Of Contracts [Line Items] $ 400,000  
Natural Gas | Derivative Contracts - May [Member] | Waha Differential Basis Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 1.40  
Volume (MMBtud) | MMBTU 50,000  
Natural Gas | Derivative Contracts - May [Member] | Rockies Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.55  
Volume (MMBtud) | MMBTU 30,000  
Natural Gas | Derivative Contracts - April through June [Member] | Collars    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 250,000  
Derivative, Cap Price | $ / MMBTU 2.50  
Derivative, Average Floor Price | $ / MMBTU 2.00  
Cash Received For Early Termination Of Contracts [Line Items] $ 7,800,000  
Natural Gas | Derivative Contracts - April through December [Member] | Waha Differential Basis Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 1.40  
Volume (MMBtud) | MMBTU 50,000  
Natural Gas | Derivative Contracts - April through December [Member] | Rockies Differential Basis Swap    
Derivatives, Fair Value [Line Items]    
Derivative, Swap Type, Average Fixed Price | $ / MMBTU 0.55  
Volume (MMBtud) | MMBTU 30,000  
Natural Gas | Derivative Contracts - August through October [Member] | Collars    
Derivatives, Fair Value [Line Items]    
Volume (MMBtud) | MMBTU 250,000  
Derivative, Cap Price | $ / MMBTU 2.50  
Derivative, Average Floor Price | $ / MMBTU 2.00