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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Short-term derivative instruments	$ 343	$ 664
Short-term derivative instruments - liabilities	$ 9,689	$ 10,442

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- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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