Derivatives Derivatives (Schedule of Subsequent Derivatives Outstanding) (Details) - Swap [Member] - Subsequent Event [Member]	1 Months Ended
	Nov. 02, 2017 $ / Unit MMBTU bbl
IF - NYMEX (HH) [Member] | Apr'18 - Oct'18 [Member] | Natural Gas [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	10,000
Weighted average price	2.990
OPIS - Mont Belvieu [Member] | Apr'18 - Sep'18 [Member] | Natural Gas Liquids [Member]
Derivative [Line Items]
Hedged volume (Bbl/day) | bbl	1,000	[1]
Weighted average price	31.164	[1]

[1] Type of liquid involved is propane.