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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Derivative Instruments (Tables) [Abstract]  
Impact of derivative instruments on the statement of operations and OCI
     Three Months Ended
     March 31,
   Location  2013  2012
Gain (loss) on interest rate swap recognized in        
 OCI (effective portion) OCI $ 946 $ 739
Gain (loss) on interest rate swaps reclassified from         
 AOCI into income (effective portion) Interest expense   (475)   (461)
Gain (loss) on forward exchange contracts recognized in         
 income (ineffective portion and amount excluded        
 from effectiveness testing) Unrealized loss   0   (555)
Gain (loss) on forward exchange contracts recognized        
 in income Realized loss   (2,309)   0
Gain (loss) on forward exchange contracts designated        
 as net investment hedge recognized in OCI OCI   75,857   0