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Derivative Financial Instruments (Schedule of Oil Derivative Contracts Volume and Weighted Average Prices) (Details)
$ in Thousands
1 Months Ended
Nov. 05, 2020
USD ($)
bbl / d
Sep. 30, 2020
bbl / d
$ / bbl
$ / MMBTU
Oil contracts | Brent swap contracts, Fourth Quarter    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   155,200
Oil contracts | Brent swap contracts, Next Year    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   0
Oil contracts | Brent collar contracts with short puts, Fourth Quarter    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   30,000
Oil contracts | Brent Collar Contracts Entered in March With Short Puts for Fourth Quarter of Year One [Member]    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   115,500
Ceiling, price per barrel   69.78
Floor, price per barrel   62.06
Short put, price per barrel   53.56
Oil contracts | Brent collar contracts with short puts, Next Year    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   96,000
Oil contracts | Brent collar contracts with short puts, Next Year | Subsequent event    
Derivative [Line Items]    
Volume, barrels per day | bbl / d 6,000  
Gain (Loss) on Derivative Liquidaton | $ $ 241  
Oil contracts | Brent Collar Contracts Entered in March With Short Puts for Year Two [Member]    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   0
Ceiling, price per barrel   0
Floor, price per barrel   0
Short put, price per barrel   0
Oil contracts | Brent call contracts sold, Fourth Quarter    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   0
Oil contracts | Brent call contracts sold, Next Year    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   20,000
Oil contracts, price per bbl | Brent swap contracts, Fourth Quarter    
Derivative [Line Items]    
Price per Bbl in usd | $ / MMBTU   36.47
Oil contracts, price per bbl | Brent swap contracts, Next Year    
Derivative [Line Items]    
Price per Bbl in usd | $ / MMBTU   0
Oil contracts, price per bbl | Brent collar contracts with short puts, Fourth Quarter    
Derivative [Line Items]    
Ceiling, price per barrel   43.09
Floor, price per barrel   34.83
Short put, price per barrel   24.83
Oil contracts, price per bbl | Brent collar contracts with short puts, Next Year    
Derivative [Line Items]    
Ceiling, price per barrel   50.61
Floor, price per barrel   44.79
Short put, price per barrel   34.88
Oil contracts, price per bbl | Brent call contracts sold, Fourth Quarter    
Derivative [Line Items]    
Price per Bbl in usd | $ / MMBTU   0
Oil contracts, price per bbl | Brent call contracts sold, Next Year    
Derivative [Line Items]    
Price per Bbl in usd | $ / MMBTU   69.74