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Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Loss - Interest Rate Swaps) (Details) (Accumulated other comprehensive loss [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Accumulated other comprehensive loss [Member]
 
Derivative Instruments  
Balance at December 31, 2012 $ 48,180
Other comprehensive income (31,066)
Balance at June 30, 2013 $ 17,114