Derivatives (Schedule of Derivatives Outstanding) (Details)	9 Months Ended
	Sep. 30, 2020 $ / Unit MMBTU bbl
Natural Gas [Member] | Basis swap [Member] | Oct'20 - Dec'20 [Member] | PEPL [Member]
Derivative [Line Items]
Weighted average price	(0.455)
Hedged volume (MMBtu/day) | MMBTU	20,000
Natural Gas [Member] | Basis swap [Member] | Oct'20 - Dec'20 [Member] | NGPL Texok [Member]
Derivative [Line Items]
Weighted average price	(0.275)
Hedged volume (MMBtu/day) | MMBTU	30,000
Natural Gas [Member] | Basis swap [Member] | Jan'21 - Dec'21 [Member] | NGPL Texok [Member]
Derivative [Line Items]
Weighted average price	(0.215)
Hedged volume (MMBtu/day) | MMBTU	30,000
Natural Gas [Member] | Collar [Member] | Oct'20 - Dec'20 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	30,000
Cap Price	2.80
Floor Price	2.5
Natural Gas [Member] | Collar [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	35,000
Cap Price	2.68
Floor Price	2.5
Natural Gas [Member] | Swap [Member] | Oct'20 - Dec'20 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.753
Hedged volume (MMBtu/day) | MMBTU	30,000
Natural Gas [Member] | Swap [Member] | Jan'21 - Oct'21 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.818
Hedged volume (MMBtu/day) | MMBTU	50,000
Natural Gas [Member] | Swap [Member] | Nov'21 - Dec'21 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.880
Hedged volume (MMBtu/day) | MMBTU	75,000
Natural Gas [Member] | Swap [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.605
Hedged volume (MMBtu/day) | MMBTU	5,000
Natural Gas [Member] | Swap [Member] | Jan'23 - Dec'23 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.456
Hedged volume (MMBtu/day) | MMBTU	22,000
Crude Oil [Member] | Swap [Member] | Oct'20 - Dec'20 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	43.35
Hedged Volume (Bbl/day) | bbl	4,000
Crude Oil [Member] | Swap [Member] | Jan'21 - Dec'21 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	44.65
Hedged Volume (Bbl/day) | bbl	3,000
Crude Oil [Member] | Swap [Member] | Jan'22 - Dec'22 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	42.250
Hedged Volume (Bbl/day) | bbl	2,300
Crude Oil [Member] | Swap [Member] | Jan'23 - Dec'23 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	43.60
Hedged Volume (Bbl/day) | bbl	1,300