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Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Consolidated Statements of Operations) (Details) (Cash Flow Interest Rate Contracts [Member], 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 OCI (effectiveness)	$ 10,782	$ 7,229	$ 9,647	$ 10,677
Loss recognized due to ineffectiveness	0	0	0	0
Interest Expense [Member]
Loss reclassified from OCI into income	$ 3,644	$ 0	$ 7,049	$ 78

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.

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- Definition

The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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