Derivatives (Amount Of Gain Or (Loss) Recognized In Accumulated OCI On Derivative) (Details) (Commodity Derivatives [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Commodity Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Accumulated OCI on Derivative (Effective Portion)	$ (963)	[1]	$ 9,912	[1]

[1] Net of taxes.