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Derivatives - Interest Rate Swap Agreements (Schedule Of Location Of Derivatives On Income Statement) (Details) (Interest Expense [Member], Interest Rate [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Interest Expense [Member] \| Interest Rate [Member]
Derivative [Line Items]
Amount of loss recognized in OCI on derivative (effective portion)	$ 273,389	$ 80,351
Amount of loss reclassified from accumulated OCI into income (effective portion)	102,614	68,418
Amount of loss recognized in income on derivative (ineffective portion)	$ 654	$ 210

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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- Definition

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

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