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Derivative Financial Instruments (Schedule Of Oil Derivative Contracts Volume And Weighted Average Prices) (Details)
3 Months Ended
Mar. 31, 2019
bbl / d
$ / bbl
Apr. 01, 2019
bbl / d
$ / bbl
Derivative [Line Items]    
Document Fiscal Year Focus 2019  
Oil contracts | Brent collar contracts with short puts for Q4 | Subsequent event    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   30,000
Oil contracts | Brent Collar Contracts With Short Puts for Second Quarter of Year One [Member]    
Derivative [Line Items]    
Volume, barrels per day | bbl / d 15,000  
Oil contracts | Brent Collar Contracts With Short Puts for Third Quarter of Year One [Member]    
Derivative [Line Items]    
Volume, barrels per day | bbl / d 15,000  
Oil contracts | Brent Collar Contracts With Short Puts for Fourth Quarter of Year One [Member]    
Derivative [Line Items]    
Volume, barrels per day | bbl / d 15,000  
Oil contracts | Brent Collar Contracts With Short Puts for Year Two [Member] | Subsequent event    
Derivative [Line Items]    
Volume, barrels per day | bbl / d   9,000
Oil contracts, price per bbl | Brent collar contracts with short puts for Q4 | Subsequent event    
Derivative [Line Items]    
Ceiling, price per barrel   75.13
Floor, price per barrel   65.00
Short put, price per barrel   55.00
Oil contracts, price per bbl | Brent Collar Contracts With Short Puts for Second Quarter of Year One [Member]    
Derivative [Line Items]    
Ceiling, price per barrel 89.90  
Floor, price per barrel 75.00  
Short put, price per barrel 65.00  
Oil contracts, price per bbl | Brent Collar Contracts With Short Puts for Third Quarter of Year One [Member]    
Derivative [Line Items]    
Ceiling, price per barrel 89.90  
Floor, price per barrel 75.00  
Short put, price per barrel 65.00  
Oil contracts, price per bbl | Brent Collar Contracts With Short Puts for Fourth Quarter of Year One [Member]    
Derivative [Line Items]    
Ceiling, price per barrel 89.90  
Floor, price per barrel 75.00  
Short put, price per barrel 65.00  
Oil contracts, price per bbl | Brent Collar Contracts With Short Puts for Year Two [Member] | Subsequent event    
Derivative [Line Items]    
Ceiling, price per barrel   75.57
Floor, price per barrel   65.00
Short put, price per barrel   55.00