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Derivatives And Hedging Activities (Effect Of Derivative Instruments On The Consolidated Statements Of Income Not Designated Derivatives) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives $ (17,516) [1] $ (10,324) [1] $ (11,440) [1]
Other Expense, Net [Member] | Goldman Sachs Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives $ (17,516) $ (10,324) $ (11,440)
[1] The loss on the interest rate swap agreement represents the change, since the beginning of the reporting period, in the fair value of an interest rate swap which we entered into on June 25, 2009. We are not using hedge accounting to record the interest rate swap, and accordingly, any change in the fair value is immediately recognized in earnings.