Derivatives (Schedule of Derivatives Outstanding) (Details)	9 Months Ended
	Sep. 30, 2021 $ / Unit MMBTU bbl
Natural Gas [Member] | Basis swap [Member] | Jul'21 - Dec'21 [Member] | NGPL Texok [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	30,000
Weighted average price	(0.22)
Natural Gas [Member] | Swap [Member] | Jul'21 - Oct'21 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	50,000
Weighted average price	2.82
Natural Gas [Member] | Swap [Member] | Nov'21 - Dec'21 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	45,000
Weighted average price	2.90
Natural Gas [Member] | Swap [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	5,000
Weighted average price	2.61
Natural Gas [Member] | Swap [Member] | Jan'23 - Dec'23 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	22,000
Weighted average price	2.46
Natural Gas [Member] | Collar [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	35,000
Natural Gas [Member] | Collar [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member] | Minimum
Derivative [Line Items]
Weighted average price	2.50
Natural Gas [Member] | Collar [Member] | Jan'22 - Dec'22 [Member] | IF - NYMEX (HH) [Member] | Maximum
Derivative [Line Items]
Weighted average price	2.68
Crude Oil [Member] | Swap [Member] | Jul'21 - Dec'21 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	45.14
Hedged Volume (Bbl/day) | bbl	3,373
Crude Oil [Member] | Swap [Member] | Jan'22 - Dec'22 [Member] | Wti Nymex [Member]
Derivative [Line Items]
Weighted average price	42.25
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