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Derivatives (Schedule of Derivatives Outstanding) (Details)
6 Months Ended
Jun. 30, 2020
$ / Unit
MMBTU
bbl
Basis swap [Member] | Jul'20 - Dec'20 [Member] | Natural Gas [Member] | PEPL [Member]  
Derivative [Line Items]  
Weighted average price (0.455)
Hedged volume (MMBtu/day) | MMBTU 20,000
Basis swap [Member] | Jul'20 - Dec'20 [Member] | Natural Gas [Member] | NGPL Texok [Member]  
Derivative [Line Items]  
Weighted average price (0.275)
Hedged volume (MMBtu/day) | MMBTU 30,000
Basis swap [Member] | Jan'21 - Dec'21 [Member] | Natural Gas [Member] | NGPL Texok [Member]  
Derivative [Line Items]  
Weighted average price (0.215)
Hedged volume (MMBtu/day) | MMBTU 30,000
Three-way collar [Member] | Jul'20 - Dec'20 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]  
Derivative [Line Items]  
Hedged volume (MMBtu/day) | MMBTU 30,000
Cap Price 2.80
Subfloor price 2.2
Floor Price 2.5
Collar | Jul'20 - Sep'20 [Member] | Crude Oil [Member] | Wti Nymex [Member]  
Derivative [Line Items]  
Cap Price 26.50
Floor Price 20
Hedged Volume (Bbl/day) | bbl 112,000