Derivatives (Schedule Of Fair Value Of Derivative Assets And Liabilities) (Details) (Other Current Assets [Member], Total Commodity Derivatives [Member], Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Current Assets [Member] | Total Commodity Derivatives [Member] | Not Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 2,922	$ 615
Derivative Asset, Fair Value, Gross Liability	(1,155)	(615)
Derivative Liability, Fair Value, Gross Liability	1,155	4,527
Derivative Liability, Fair Value, Gross Asset	1,155	4,527
Derivative Liability	0	0
Derivative Asset	$ 1,767	$ 0