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Accumulated Other Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2012
Accumulated Other Comprehensive Income [Abstract]  
Schedule Of Accumulated Other Comprehensive Income
    For the Three Months Ended March 31, 2012  
    Unrealized loss on investments, net of tax     Unrealized gain on derivatives instruments, net of tax     Cumulative translation adjustment  
Beginning balance   $ (287 )   $ 3,206     $ 12,524  
Current-period other comprehensive income     111       (1,701 )     5,628  
Ending balance   $ (176 )   $ 1,505     $ 18,152