Fair Value Measurements (Schedule Of Quantitative Information About Unobservable Inputs) (Details) - Jun. 30, 2015 - Level 3 [Member] - Collar [Member] $ in Thousands		USD ($) $ / Unit
Crude Oil [Member]
Derivative fair value | $	[1]	$ 239
Derivatives Valuation Technique(s)		Discounted cash flow
Unobservable Input		Forward commodity price curve
Crude Oil [Member] | Minimum [Member]
Forward commodity price curve		0.37
Crude Oil [Member] | Maximum [Member]
Forward commodity price curve		4.33
Natural Gas [Member]
Derivative fair value | $	[1]	$ (32)
Derivatives Valuation Technique(s)		Discounted cash flow
Unobservable Input		Forward commodity price curve
Natural Gas [Member] | Minimum [Member]
Forward commodity price curve		0.00
Natural Gas [Member] | Maximum [Member]
Forward commodity price curve		0.15

[1] The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be paid or received within the settlement period.