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Price-Risk Management Price-Risk Management (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
bbl
MMBTU
$ / MMBTU
$ / Boe
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
bbl
MMBTU
$ / MMBTU
$ / Boe
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Price Risk Derivatives, Net | $ $ (88,600) $ (12,900) $ (152,900) $ 66,900  
Cash settlement (paid) received on derivatives | $     (28,976) 76,150  
Cash Received (Paid) On Monetized Derivative Contracts | $       38,300  
Receivables for Settled Derivatives | $ 100   100   $ 800
Payables for Settled Derivatives | $ 13,621   13,621   829
Derivative, Fair Value, Net | $ (116,100)   (116,100)   (6,000)
Cash settlements on derivatives | $     (29,000) $ 76,100  
Other Current Assets [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset | $ 700   700   4,800
Other Noncurrent Assets [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Asset, Fair Value, Gross Asset | $ 100   100   300
Other Current Liabilities [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability | $ 94,800   94,800   8,200
Other Noncurrent Liabilities [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability | $ $ 22,000   $ 22,000   $ 2,900
Swap [Member] | Oil Derivative Swaps | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 272,662   272,662    
Derivative, Swap Type, Fixed Price | $ / Boe 57.50   57.50    
Swap [Member] | Oil Derivative Swaps | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 223,455   223,455    
Derivative, Swap Type, Fixed Price | $ / Boe 49.32   49.32    
Swap [Member] | Oil Derivative Swaps | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 136,500   136,500    
Derivative, Swap Type, Fixed Price | $ / Boe 56.66   56.66    
Swap [Member] | Oil Derivative Swaps | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 246,100   246,100    
Derivative, Swap Type, Fixed Price | $ / Boe 49.63   49.63    
Swap [Member] | Oil Derivative Swaps | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 184,000   184,000    
Derivative, Swap Type, Fixed Price | $ / Boe 54.84   54.84    
Swap [Member] | Oil Derivative Swaps | First Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 81,900   81,900    
Derivative, Swap Type, Fixed Price | $ / Boe 55.70   55.70    
Swap [Member] | Natural Gas Derivative Swaps | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 1,530,000   1,530,000    
Derivative, Swap Type, Fixed Price 3.60   3.60    
Swap [Member] | Natural Gas Derivative Swaps | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 232,500   232,500    
Derivative, Swap Type, Fixed Price 4.00   4.00    
Swap [Member] | Natural Gas Derivative Swaps | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 3,795,000   3,795,000    
Derivative, Swap Type, Fixed Price 2.99   2.99    
Swap [Member] | Natural Gas Derivative Swaps | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,142,100   4,142,100    
Derivative, Swap Type, Fixed Price 3.02   3.02    
Swap [Member] | Natural Gas Derivative Swaps | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 2,760,000   2,760,000    
Derivative, Swap Type, Fixed Price 3.14   3.14    
Swap [Member] | NGL Derivative | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 192,324   192,324    
Derivative, Swap Type, Fixed Price 24.26   24.26    
Swap [Member] | NGL Derivative | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 135,000   135,000    
Derivative, Swap Type, Fixed Price 25.75   25.75    
Swap [Member] | NGL Derivative | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 91,000   91,000    
Derivative, Swap Type, Fixed Price 26.87   26.87    
Swap [Member] | NGL Derivative | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 92,000   92,000    
Derivative, Swap Type, Fixed Price 26.87   26.87    
Swap [Member] | NGL Derivative | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 92,000   92,000    
Derivative, Swap Type, Fixed Price 26.87   26.87    
Collar Contracts [Member] | Oil Derivative Swaps | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 84,640   84,640    
Derivative, Average Floor Price 34.70   34.70    
Derivative, Average Cap Price 41.01   41.01    
Collar Contracts [Member] | Oil Derivative Swaps | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 40,500   40,500    
Derivative, Average Floor Price 40.00   40.00    
Derivative, Average Cap Price 45.55   45.55    
Collar Contracts [Member] | Oil Derivative Swaps | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 115,850   115,850    
Derivative, Average Floor Price 39.25   39.25    
Derivative, Average Cap Price 46.20   46.20    
Collar Contracts [Member] | Oil Derivative Swaps | Second Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 65,975   65,975    
Derivative, Average Floor Price 56.00   56.00    
Derivative, Average Cap Price 63.20   63.20    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 9,301,000   9,301,000    
Derivative, Average Floor Price 2.73   2.73    
Derivative, Average Cap Price 3.15   3.15    
Collar Contracts [Member] | Natural Gas Derivative Swaps | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 9,055,000   9,055,000    
Derivative, Average Floor Price 2.87   2.87    
Derivative, Average Cap Price 3.55   3.55    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 6,156,500   6,156,500    
Derivative, Average Floor Price 2.29   2.29    
Derivative, Average Cap Price 2.74   2.74    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 6,739,000   6,739,000    
Derivative, Average Floor Price 2.60   2.60    
Derivative, Average Cap Price 2.98   2.98    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 7,765,076   7,765,076    
Derivative, Average Floor Price 2.69   2.69    
Derivative, Average Cap Price 3.20   3.20    
Collar Contracts [Member] | Natural Gas Derivative Swaps | First Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 8,347,000   8,347,000    
Derivative, Average Floor Price 2.89   2.89    
Derivative, Average Cap Price 3.52   3.52    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Second Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,125,000   4,125,000    
Derivative, Average Floor Price 2.49   2.49    
Derivative, Average Cap Price 2.92   2.92    
Collar Contracts [Member] | Natural Gas Derivative Swaps | Third Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 1,380,000   1,380,000    
Derivative, Average Floor Price 2.60   2.60    
Derivative, Average Cap Price 3.13   3.13    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 11,040,000   11,040,000    
Derivative, Swap Type, Fixed Price (0.013)   (0.013)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 8,100,000   8,100,000    
Derivative, Swap Type, Fixed Price 0.093   0.093    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 3,640,000   3,640,000    
Derivative, Swap Type, Fixed Price (0.051)   (0.051)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 3,680,000   3,680,000    
Derivative, Swap Type, Fixed Price (0.043)   (0.043)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 3,680,000   3,680,000    
Derivative, Swap Type, Fixed Price (0.048)   (0.048)    
Basis Swap [Member] | Oil Basis Derivative [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 241,500   241,500    
Derivative, Swap Type, Fixed Price 1.28   1.28    
Basis Swap [Member] | Oil Basis Calendar Monthly Roll Differential Swap | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 241,500   241,500    
Derivative, Swap Type, Fixed Price (0.33)   (0.33)    
Basis Swap [Member] | Oil Basis Calendar Monthly Roll Differential Swap | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 261,000   261,000    
Derivative, Swap Type, Fixed Price 0.19   0.19    
Basis Swap [Member] | Oil Basis Calendar Monthly Roll Differential Swap | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 263,900   263,900    
Derivative, Swap Type, Fixed Price 0.19   0.19    
Basis Swap [Member] | Oil Basis Calendar Monthly Roll Differential Swap | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 266,800   266,800    
Derivative, Swap Type, Fixed Price 0.19   0.19    
Basis Swap [Member] | Oil Basis Calendar Monthly Roll Differential Swap | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 266,800   266,800    
Derivative, Swap Type, Fixed Price 0.19   0.19