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Price-Risk Management Price-Risk Management (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
MMBTU
bbl
$ / MMBTU
$ / Boe
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
MMBTU
bbl
$ / MMBTU
$ / Boe
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Gain (Loss) on Price Risk Derivatives, Net | $ $ (46,100) $ (8,500) $ (64,300) $ 79,800  
Cash Received (Paid) On Settlements of Derivative Contracts | $     (10,708) 67,496  
Cash Received (Paid) On Monetized Derivative Contracts | $       $ 38,300  
Receivables for Settled Derivatives | $ 400   400   $ 800
Payables for Settled Derivatives | $ 5,100   5,100   800
Derivative, Fair Value, Net | $ (54,900)   (54,900)   (6,000)
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 | $ 45,400   45,400   8,200
Other Noncurrent Liabilities [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative Liability, Fair Value, Gross Liability | $ $ 10,300   $ 10,300   $ 2,900
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 179,759   179,759    
Derivative, Swap Type, Fixed Price | $ / Boe 51.19   51.19    
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 191,412   191,412    
Derivative, Swap Type, Fixed Price | $ / Boe 53.60   53.60    
Swap [Member] | Oil Derivative Swaps [Member] | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 178,455   178,455    
Derivative, Swap Type, Fixed Price | $ / Boe 45.77   45.77    
Swap [Member] | Oil Derivative Swaps [Member] | 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 | $ / Boe 54.00   54.00    
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 200,100   200,100    
Derivative, Swap Type, Fixed Price | $ / Boe 47.05   47.05    
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 138,000   138,000    
Derivative, Swap Type, Fixed Price | $ / Boe 53.20   53.20    
Swap [Member] | Oil Derivative Swaps [Member] | 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 [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 330,000   330,000    
Derivative, Swap Type, Fixed Price 2.62   2.62    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 290,000   290,000    
Derivative, Swap Type, Fixed Price 2.69   2.69    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 2,100   2,100    
Derivative, Swap Type, Fixed Price 2.50   2.50    
Swap [Member] | NGL Derivative | Third 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 | 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 45,000   45,000    
Derivative, Swap Type, Fixed Price 23.52   23.52    
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 90,620   90,620    
Derivative, Average Floor Price 34.34   34.34    
Derivative, Average Cap Price 39.87   39.87    
Collar Contracts [Member] | Oil Derivative Swaps [Member] | 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 [Member] | 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 [Member] | 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 [Member] | Second Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 36,400   36,400    
Derivative, Average Floor Price 56.00   56.00    
Derivative, Average Cap Price 63.20   63.20    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 8,185,175   8,185,175    
Derivative, Average Floor Price 2.36   2.36    
Derivative, Average Cap Price 2.82   2.82    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 8,991,000   8,991,000    
Derivative, Average Floor Price 2.61   2.61    
Derivative, Average Cap Price 2.98   2.98    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 8,465,000   8,465,000    
Derivative, Average Floor Price 2.72   2.72    
Derivative, Average Cap Price 3.36   3.36    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 5,246,500   5,246,500    
Derivative, Average Floor Price 2.15   2.15    
Derivative, Average Cap Price 2.60   2.60    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,899,000   4,899,000    
Derivative, Average Floor Price 2.39   2.39    
Derivative, Average Cap Price 2.72   2.72    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2022          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,545,076   4,545,076    
Derivative, Average Floor Price 2.41   2.41    
Derivative, Average Cap Price 2.88   2.88    
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2023          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 4,297,000   4,297,000    
Derivative, Average Floor Price 2.62   2.62    
Derivative, Average Cap Price 3.11   3.11    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | MMBTU 10,120,000   10,120,000    
Derivative, Swap Type, Fixed Price (0.022)   (0.022)    
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 6,300,000   6,300,000    
Derivative, Swap Type, Fixed Price 0.052   0.052    
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 2,730,000   2,730,000    
Derivative, Swap Type, Fixed Price (0.063)   (0.063)    
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 2,760,000   2,760,000    
Derivative, Swap Type, Fixed Price (0.063)   (0.063)    
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 2,760,000   2,760,000    
Derivative, Swap Type, Fixed Price (0.063)   (0.063)    
Basis Swap [Member] | Oil Basis Derivative [Member] | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 262,200   262,200    
Derivative, Swap Type, Fixed Price 1.27   1.27    
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 | Third Quarter 2021 [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Oil and Gas Production Hedged Volumes | bbl 253,000   253,000    
Derivative, Swap Type, Fixed Price (0.34)   (0.34)    
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 216,000   216,000    
Derivative, Swap Type, Fixed Price 0.09   0.09    
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 218,400   218,400    
Derivative, Swap Type, Fixed Price 0.09   0.09    
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 220,800   220,800    
Derivative, Swap Type, Fixed Price 0.09   0.09    
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 220,800   220,800    
Derivative, Swap Type, Fixed Price 0.09   0.09