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Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2021
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] As of March 31, 2021, we had the following outstanding derivative contracts. When aggregating multiple contracts, the weighted-average contract price is shown:
 CollarsFixed-Price Swaps 
Commodity/ Index/
Maturity Period
Quantity
(Crude oil -
MBbls
Natural Gas - BBtu)
Weighted-Average
Contract Price
Quantity
(Crude Oil - MBbls
Gas and Basis-
BBtu)
Weighted-
Average
Contract
Price
Fair Value
March 31,
2021
(in thousands)
FloorsCeilings
Crude Oil
NYMEX
20213,255 $38.47 $49.76 7,576 $45.33 $(126,882)
20222,112 45.74 58.34 6,384 43.65 (69,493)
2023— — — 2,010 53.73 3,856 
Total Crude Oil5,367 15,970 $(192,519)
Natural Gas
NYMEX
202154,900 2.51 2.92 23,850 2.40 (10,278)
202217,400 2.50 2.89 14,700 2.65 554 
2023— — — 10,200 2.50 (406)
Total Natural Gas72,300 48,750 (10,130)
Basis Protection - Natural Gas
CIG
202178,750 (0.44)(18,592)
202232,100 (0.33)(5,242)
202310,200 (0.23)(200)
Total Basis Protection - Natural Gas121,050 (24,034)
Commodity Derivatives Fair Value$(226,683)
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
Derivatives Not Designated as Hedging Instruments [Table Text Block]
The following table reflects the impact of netting agreements on gross derivative assets and liabilities as of the dates indicated:
As of March 31, 2021Total Gross Amount Presented on Balance SheetEffect of Master Netting AgreementsTotal Net Amount
(in thousands)
Derivative assets:
Derivative instruments, at fair value$23,619 $(22,760)$859 
Derivative liabilities:
Derivative instruments, at fair value$250,302 $(22,760)$227,542 
As of December 31, 2020Total Gross Amount Presented on Balance SheetEffect of Master Netting AgreementsTotal Net Amount
(in thousands)
Derivative assets:
Derivative instruments, at fair value$58,434 $(39,691)$18,743 
Derivative liabilities:
Derivative instruments, at fair value$134,511 $(39,691)$94,820