Derivatives (Schedule of Derivatives Outstanding) (Details)	9 Months Ended
	Sep. 30, 2019 $ / Unit MMBTU bbl
Swap [Member] | Oct'19 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.900
Hedged volume (MMBtu/day) | MMBTU	60,000
Swap [Member] | Nov'19 - Dec'19 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.900
Hedged volume (MMBtu/day) | MMBTU	40,000
Swap [Member] | Oct'19 - Dec'19 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Weighted average price	59.80
Hedged volume (Bbl/day) | bbl	2,000
Basis swap [Member] | Oct'19 - Dec'19 [Member] | Natural Gas [Member] | PEPL [Member]
Derivative [Line Items]
Weighted average price	(0.659)
Hedged volume (MMBtu/day) | MMBTU	20,000
Basis swap [Member] | Oct'19 - Dec'19 [Member] | Natural Gas [Member] | NGPL Midcon [Member]
Derivative [Line Items]
Weighted average price	(0.625)
Hedged volume (MMBtu/day) | MMBTU	10,000
Basis swap [Member] | Oct'19 - Dec'19 [Member] | Natural Gas [Member] | NGPL Texok [Member]
Derivative [Line Items]
Weighted average price	(0.265)
Hedged volume (MMBtu/day) | MMBTU	30,000
Basis swap [Member] | Jan'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] | Jan'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
Collar [Member] | Oct'19 - Dec'19 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	20,000
Cap Price	3.03
Floor Price	2.63
Three-way collar [Member] | Oct'19 - Dec'19 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Hedged volume (Bbl/day) | bbl	4,000
Cap Price	72.925
Subfloor price	51.25
Floor Price	61.25