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Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Consolidated Statements of Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments and Hedging Activities
(Gain)/loss recognized in OCI (effectiveness)	$ 29,567	$ 12,411
Loss reclassified from OCI into income		$ 3,073

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References+ Details