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Derivative Instruments and Hedging Activities (Impact of Non Designated Derivative Instruments on Income Statement) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (Loss) Recognized in Income on Derivatives	$ 6	$ 2,084	$ 614	$ (823)
Natural Gas Contracts [Member] \| Gain On Oil and Gas Derivative Contracts [Member]
Gain (Loss) Recognized in Income on Derivatives	0	2,482	0	2,482
Foreign Exchange Forward [Member] \| Other Expense [Member]
Gain (Loss) Recognized in Income on Derivatives	$ 6	$ (398)	$ 614	$ (3,305)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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