Fair Value Measurements (Schedule Of Quantitative Information About Unobservable Inputs) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended				3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Crude Oil [Member] Level 3 [Member] Collar [Member]		Mar. 31, 2014 Crude Oil [Member] Level 3 [Member] Collar [Member] Minimum [Member]	Mar. 31, 2014 Crude Oil [Member] Level 3 [Member] Collar [Member] Maximum [Member]	Mar. 31, 2014 Natural Gas [Member] Level 3 [Member] Collar [Member]		Mar. 31, 2014 Natural Gas [Member] Level 3 [Member] Collar [Member] Minimum [Member]	Mar. 31, 2014 Natural Gas [Member] Level 3 [Member] Collar [Member] Maximum [Member]
Derivative Liability, Fair Value, Gross Liability	$ (14,540)	$ (7,044)	$ (3,723)	[1]			$ (741)	[1]
Derivatives Valuation Technique(s)			Discounted cash flow				Discounted cash flow
Unobservable Input			Forward commodity price curve				Forward commodity price curve
Forward commodity price curve					0.11	6.73			0.00	0.53

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