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Risk Management Activities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
MMBTU
$ / bbl
$ / MMBTU
bbl
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]        
Volume (MMBtud) | MMBTU   50,000    
Weighted Average Price (MMBtu)   1.40    
Assets from Price Risk Management Activities | $   $ 18,417   $ 1,299
Liabilities from Price Risk Management Activities | $   23,486   20,194
Derivative Liability, Noncurrent | $   1,053   0
Derivative Collateral [Abstract]        
Collateral Had on Derivative | $   0   0
Collateral Held on Derivative | $   0   0
Total Gains | $   1,075,433 $ 242,622  
Net Cash Received from Settlements of Commodity Derivative Contracts | $   998,894 $ 139,708  
Price Risk Derivative        
Derivatives, Fair Value [Line Items]        
Other Assets | $   156   0
Assets From Price Risk Management Activities        
Derivatives, Fair Value [Line Items]        
Assets from Price Risk Management Activities | $   23,000   3,000
Liabilities from Price Risk Management Activities | $   5,000   2,000
Assets From Price Risk Management Activities | Price Risk Derivative        
Derivatives, Fair Value [Line Items]        
Assets from Price Risk Management Activities | $ [1]   18,417   1,299
Liabilities From Price Risk Management Activities        
Derivatives, Fair Value [Line Items]        
Assets from Price Risk Management Activities | $       3,000
Liabilities from Price Risk Management Activities | $   26,000   23,000
Other Assets | $   3,000    
Liabilities From Price Risk Management Activities | Price Risk Derivative        
Derivatives, Fair Value [Line Items]        
Liabilities from Price Risk Management Activities | $ [2]   23,486   $ 20,194
Crude Oil | Roll Differential Swap        
Derivative Collateral [Abstract]        
Net Cash Received from Settlements of Commodity Derivative Contracts | $ $ 1,100 2,100    
Crude Oil | Price Swaps        
Derivative Collateral [Abstract]        
Net Cash Received from Settlements of Commodity Derivative Contracts | $ 4,100 $ 359,900    
Crude Oil | Derivative Contracts - May (closed) | ICE Brent Differential Basis Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   10,000    
Weighted Average Price ($/Bbl)   (4.92)    
Crude Oil | Derivative Contracts - May (closed) | Houston Differential Basis Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   10,000    
Weighted Average Price ($/Bbl)   (1.55)    
Crude Oil | Derivative Contracts - February through June (closed) | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   10,000    
Weighted Average Price ($/Bbl)   (0.70)    
Crude Oil | Derivative Contracts - July through September (closed) | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   88,000    
Weighted Average Price ($/Bbl)   (1.16)    
Crude Oil | Derivative Contracts - October (closed) | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   66,000    
Weighted Average Price ($/Bbl)   (1.16)    
Crude Oil | Derivative Contracts - October (closed) | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   154,000    
Weighted Average Price ($/Bbl)   (50.42)    
Crude Oil | Derivative Contracts - November through December | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   66,000    
Weighted Average Price ($/Bbl)   (1.16)    
Crude Oil | Derivative Contracts - November through December | Price Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl)   (31.00)    
Crude Oil | Derivative Contracts - April through May (closed) | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   265,000    
Weighted Average Price ($/Bbl)   (51.36)    
Crude Oil | Derivative Contracts - January through March (closed) | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   200,000    
Weighted Average Price ($/Bbl)   (59.33)    
Crude Oil | OffSetting Derivative Contracts - July through September | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   22,000    
Weighted Average Price ($/Bbl)   (0.43)    
Crude Oil | OffSetting Derivative Contracts - June | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   265,000    
Weighted Average Price ($/Bbl)   (33.80)    
Crude Oil | OffSetting Derivative Contracts - July | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   254,000    
Weighted Average Price ($/Bbl)   (33.75)    
Crude Oil | OffSetting Derivative Contracts - August through September | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   154,000    
Weighted Average Price ($/Bbl)   (34.18)    
Crude Oil | Derivative Contacts - April (closed) | ICE Brent Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   75,000    
Weighted Average Price ($/Bbl)   (25.66)    
Crude Oil | Derivative Contacts - May (closed) | ICE Brent Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   35,000    
Weighted Average Price ($/Bbl)   (26.53)    
Crude Oil | OffSetting Derivative Contracts - October through December | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   44,000    
Weighted Average Price ($/Bbl)   (0.73)    
Crude Oil | OffSetting Derivative Contracts - October through December | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   47,000    
Weighted Average Price ($/Bbl)   (30.04)    
Crude Oil | Derivative Contracts - June [Member] | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   265,000    
Weighted Average Price ($/Bbl)   (51.36)    
Crude Oil | Derivative Contracts - July [Member] | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   254,000    
Weighted Average Price ($/Bbl)   (42.36)    
Crude Oil | Derivative Contracts - July through September [Member] | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   22,000    
Weighted Average Price ($/Bbl)   (1.16)    
Crude Oil | New Derivative Contracts - October through December [Member] | Roll Differential Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   44,000    
Crude Oil | New Derivative Contracts - October through December [Member] | Price Swaps        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   47,000    
Natural Gas Liquids | Mont Belvieu Propane Price Swap        
Derivative Collateral [Abstract]        
Net Cash Received from Settlements of Commodity Derivative Contracts | $ 3,500 $ 5,700    
Natural Gas Liquids | Derivative Contracts - January through February (closed) | Mont Belvieu Propane Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   4,000    
Weighted Average Price ($/Bbl)   (21.34)    
Natural Gas Liquids | Derivative Contracts - May through December | Mont Belvieu Propane Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   25,000    
Weighted Average Price ($/Bbl)   (17.92)    
Natural Gas Liquids | Offsetting Derivative Contracts - May through December [Member] | Mont Belvieu Propane Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   25,000    
Weighted Average Price ($/Bbl)   (16.41)    
Natural Gas Liquids | Derivative Contracts - March through April (closed) | Mont Belvieu Propane Price Swap        
Derivatives, Fair Value [Line Items]        
Volume (Bbld) | bbl   25,000    
Weighted Average Price ($/Bbl)   (17.92)    
Natural Gas | Collars        
Derivative Collateral [Abstract]        
Net Cash Received from Settlements of Commodity Derivative Contracts | $   $ 1,100    
Natural Gas | Waha Differential Basis Swaps        
Derivative Collateral [Abstract]        
Total Gains | $   $ 7,400    
Net Cash Received from Settlements of Commodity Derivative Contracts | $ $ 4,500      
Natural Gas | Derivative Contracts - April through December (closed) | HSC Differential Basis Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (0.05)    
Volume (MMBtud) | MMBTU   60,000    
Cash Paid For Early Termination Of Contracts | $   $ 400    
Natural Gas | Derivative Contracts - January through December (closed) | HSC Differential Basis Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (0.05)    
Volume (MMBtud) | MMBTU   60,000    
Natural Gas | Derivative Contracts - April through July (closed) | Collars        
Derivatives, Fair Value [Line Items]        
Volume (MMBtud) | MMBTU   250,000    
Weighted Average Price (MMBtu) | $ / MMBTU   2.50    
Weighted Average Floor Price (MMBtu) | $ / MMBTU   2.00    
Cash Received For Early Termination Of Contracts | $   $ 7,800    
Natural Gas | Derivative Contracts - January through April (closed) | Waha Differential Basis Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (1.40)    
Volume (MMBtud) | MMBTU   50,000    
Natural Gas | Derivative Contracts - August through October | Collars        
Derivatives, Fair Value [Line Items]        
Volume (MMBtud) | MMBTU   250,000    
Weighted Average Price (MMBtu) | $ / MMBTU   2.50    
Weighted Average Floor Price (MMBtu) | $ / MMBTU   2.00    
Natural Gas | Derivative Contracts - January through September (closed) | Rockies Differential Basis Swap        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (0.55)    
Volume (MMBtud) | MMBTU   30,000    
Natural Gas | Derivative Contracts - October though December | Rockies Differential Basis Swap        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (0.55)    
Volume (MMBtud) | MMBTU   30,000    
Natural Gas | Offsetting Derivative Contracts - May through December [Member] | Waha Differential Basis Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl) | $ / MMBTU   (0.43)    
Volume (MMBtud) | MMBTU   50,000    
Natural Gas | Offsetting Derivative Contracts - August through October [Member] | Collars        
Derivatives, Fair Value [Line Items]        
Volume (MMBtud) | MMBTU   250,000    
Weighted Average Price (MMBtu) | $ / MMBTU   2.50    
Weighted Average Floor Price (MMBtu) | $ / MMBTU   2.00    
Natural Gas | Derivative Contracts - Year Two | Price Swaps        
Derivatives, Fair Value [Line Items]        
Weighted Average Price ($/Bbl)   (2.85)    
Volume (MMBtud) | MMBTU   150,000    
[1] The current portion of Assets from Price Risk Management Activities consists of gross assets of $23 million, partially offset by gross liabilities of $5 million at September 30, 2020. 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.
[2] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $26 million, partially offset by gross assets of $3 million, at September 30, 2020. 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