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Risk Management Activities (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
bbl
Dec. 31, 2020
USD ($)
MMBTU
$ / bbl
$ / MMBTU
bbl
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2021
USD ($)
Derivatives, Fair Value [Line Items]          
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts | $   $ 1,144,737,000 $ 180,275,000 $ (165,640,000)  
Net Cash Received from (Payments for) Settlements of Commodity Derivatives Contracts | $   1,070,647,000 231,229,000 (258,906,000)  
Assets from Price Risk Management Activities | $   64,559,000 1,299,000    
Liabilities from Price Risk Management Activities | $   $ 0 $ 20,194,000    
Receivable Major Customer Percentage   10.00% 10.00%    
Derivative Collateral [Abstract]          
Collateral Held on Derivative | $   $ 0   0  
Collateral Had on Derivaitve | $   0   $ 0  
Price Risk Derivative [Member]          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Noncurrent | $   1,063,000 $ 0    
Derivative Liability, Noncurrent | $   455,000 0    
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 | $ [1]   0 20,194,000    
Assets 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 | $     2,000,000    
Assets From Price Risk Management Activities [Member] | Price Risk Derivative [Member]          
Derivatives, Fair Value [Line Items]          
Assets from Price Risk Management Activities | $ [2]   64,559,000 $ 1,299,000    
Crude Oil | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Cash Received (Paid) On Derivative Instruments Net | $   3,200,000      
Crude Oil | Price Swaps          
Derivatives, Fair Value [Line Items]          
Cash Received (Paid) On Derivative Instruments Net | $   $ 362,600,000     $ 1,400,000
Crude Oil | Derivative Contracts - May (closed) | ICE Brent Differential Basis Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   10,000      
Weighted Average Price | $ / bbl   4.92      
Crude Oil | Derivative Contracts - May (closed) | Houston Differential Basis Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   10,000      
Weighted Average Price | $ / bbl   1.55      
Crude Oil | Derivative Contracts - May (closed) | ICE Brent Price Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   35,000      
Weighted Average Price | $ / bbl   26.53      
Crude Oil | Derivative Contacts - April (closed) | ICE Brent Price Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   75,000      
Weighted Average Price | $ / bbl   25.66      
Crude Oil | Derivative Contracts - February through June (closed) | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   10,000      
Weighted Average Price | $ / bbl   0.70      
Crude Oil | Derivative Contracts - July through September (closed) | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   88,000      
Weighted Average Price | $ / bbl   (1.16)      
Crude Oil | Derivative Contracts - October through December (closed) | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   66,000      
Weighted Average Price | $ / bbl   (1.16)      
Crude Oil | Derivative Contracts - October through December (closed) | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   47,000      
Crude Oil | Derivative Contracts - Year Two - February through December | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   25,000      
Weighted Average Price | $ / bbl   0.10      
Crude Oil | Derivative Contracts - Year Three - January through December | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   50,000      
Weighted Average Price | $ / bbl   0.11      
Crude Oil | OffSetting Derivative Contracts - July through September | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   22,000      
Weighted Average Price | $ / bbl   0.43      
Crude Oil | Derivative Contracts - July through September | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   22,000      
Crude Oil | Derivative Contracts - October through December | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   44,000      
Crude Oil | OffSetting Derivative Contracts - October through December | Roll Differential Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   44,000      
Weighted Average Price | $ / bbl   0.73      
Crude Oil | OffSetting Derivative Contracts - October through December | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   47,000      
Weighted Average Price | $ / bbl   30.04      
Crude Oil | Derivative Contracts - January through March (closed) | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   200,000      
Weighted Average Price | $ / bbl   59.33      
Crude Oil | Derivative Contracts - April through May (closed) | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   265,000      
Weighted Average Price | $ / bbl   51.36      
Crude Oil | Derivative Contracts - June (closed) | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   265,000      
Crude Oil | OffSetting Derivative Contracts - June | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   265,000      
Weighted Average Price | $ / bbl   33.80      
Crude Oil | Derivative Contracts - July (closed) | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   254,000      
Crude Oil | OffSetting Derivative Contracts - July | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   254,000      
Weighted Average Price | $ / bbl   33.75      
Crude Oil | Derivative Contracts - August Through September | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   154,000      
Crude Oil | OffSetting Derivative Contracts - August through September | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   154,000      
Weighted Average Price | $ / bbl   34.18      
Crude Oil | Price Swaps | Derivative Contracts - June (closed)          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / bbl   51.36      
Crude Oil | Price Swaps | Derivative Contracts - July (closed)          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / bbl   42.36      
Crude Oil | Price Swaps | Derivative Contracts - August Through September          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / bbl   50.42      
Crude Oil | Price Swaps | Derivative Contracts - October through December (closed)          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / bbl   31.00      
Natural Gas Liquids | Mont Belvieu Propane Price Swap          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / bbl   8,000,000.0      
Cash Received (Paid) On Derivative Instruments Net | $         1,200,000
Natural Gas Liquids | Derivative Contracts - January through February (closed) | Mont Belvieu Propane Price Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld) 4,000        
Weighted Average Price | $ / bbl   21.34      
Natural Gas Liquids | Derivative Contracts - March through April (closed) | Mont Belvieu Propane Price Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld) 25,000        
Weighted Average Price | $ / bbl   17.92      
Natural Gas Liquids | Derivative Contracts - May through December (closed) [Member] | Mont Belvieu Propane Price Swap          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   25,000      
Weighted Average Price | $ / bbl   17.92      
Natural Gas | Price Swaps          
Derivatives, Fair Value [Line Items]          
Cash Received (Paid) On Derivative Instruments Net | $         $ 25,200,000
Natural Gas | Collars          
Derivatives, Fair Value [Line Items]          
Cash Received (Paid) On Derivative Instruments Net | $   $ 1,100,000      
Cash Received For Early Termination Of Contracts | $   7,800,000      
Natural Gas | HSC Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Cash Paid For Early Termination Of Contracts | $   400,000      
Natural Gas | Waha Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Cash Received (Paid) On Derivative Instruments Net | $   $ 11,900,000      
Natural Gas | Derivative Contracts - Year Three - January through December | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   20,000      
Weighted Average Price | $ / MMBTU   2.75      
Natural Gas | Derivative Contracts - Year Two - April through December | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   500,000      
Weighted Average Price | $ / MMBTU   2.99      
Natural Gas | Derivative Contracts - Year Two - January through March [Member] | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   500,000      
Natural Gas | Derivative Contracts - April through July (closed) | Collars          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   250,000      
Weighted Average Price (MMBtu) | $ / MMBTU   2.50      
Derivative, Average Floor Price | $ / MMBTU   2.00      
Natural Gas | Offsetting Derivative Contracts - August Through October | Collars          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   250,000      
Derivative, Average Floor Price | $ / MMBTU   2.00      
Natural Gas | Derivative Contracts - January through December (closed) [Member] | HSC Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   60,000      
Weighted Average Price | $ / MMBTU   0.05      
Natural Gas | Derivative Contracts - January through December (closed) [Member] | Rockies Differential Basis Swap          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   30,000      
Weighted Average Price | $ / MMBTU   0.55      
Natural Gas | Derivative Contracts - January through April (closed) | Waha Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Volume (MMBTU) | MMBTU   50,000      
Weighted Average Price | $ / bbl   1.40      
Natural Gas | Offsetting Derivative Contracts - May Through December | Waha Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   50,000      
Weighted Average Price | $ / bbl   0.43      
Natural Gas | Derivative Contracts - May through December (closed) [Member] | Waha Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   50,000      
Weighted Average Price | $ / bbl   1.40      
Natural Gas | Offsetting Derivative Contracts - Year Two - January through March | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   500,000      
Weighted Average Price | $ / MMBTU   2.43      
Natural Gas | Derivative Contracts - April through December (closed) | HSC Differential Basis Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / MMBTU   0.05      
Natural Gas | Derivative Contracts - April through December (closed) | Rockies Differential Basis Swap          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / MMBTU   60,000      
Natural Gas | Price Swaps | Derivative Contracts - Year Two - January through March [Member]          
Derivatives, Fair Value [Line Items]          
Weighted Average Price | $ / MMBTU   2.99      
Natural Gas | Collars | Offsetting Derivative Contracts - August Through October          
Derivatives, Fair Value [Line Items]          
Weighted Average Price (MMBtu) | $ / MMBTU   2.50      
Mont Belvieu Propane Price Swap | Offsetting Derivative Contracts - May Through December | Price Swaps          
Derivatives, Fair Value [Line Items]          
Volume (Bbld)   25,000      
Weighted Average Price | $ / bbl   16.41      
[1] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $23 million, partially offset by gross assets of $3 million at December 31, 2019.
[2] The current portion of Assets from Price Risk Management Activities consists of gross assets of $3 million, partially offset by gross liabilities of $2 million, at December 31, 2019.