Derivative Instruments And Hedging Activities (Impact Of Non Designated Derivative Instruments On Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) Recognized in Income on Derivatives	$ (15,443)	$ 233
Foreign Exchange Contracts [Member] | Other Expense [Member]
Gain (Loss) Recognized in Income on Derivatives	(1,244)	233
Oil And Natural Gas Commodity Contracts [Member] | Non Hedge Loss On Commodity Derivative Contracts [Member]
Gain (Loss) Recognized in Income on Derivatives	(14,113)
Interest Rate Swaps [Member] | Other Expense [Member]
Gain (Loss) Recognized in Income on Derivatives	$ (86)