Derivatives (Amount Of Gain Or (Loss) Recognized In Accumulated OCI On Derivative) (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivative	$ 37,323	[1]	$ 12,266	[1]
Interest Rate Swaps [Member]
Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivative	0	[1]	(1,193)	[1]
Commodity Derivatives [Member]
Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivative	$ 37,323	[1]	$ 13,459	[1]

[1] Net of taxes.