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Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Loss - Interest Rate Swaps) (Details) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Interest Rate Swap [Member]
 
Derivative Instruments, Gain (Loss)  
Balance at December 31, 2011 $ 100,292
Other comprehensive income (36,322)
Balance at September 30, 2012 $ 63,970