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Derivative Instruments (Tables)
3 Months Ended
Sep. 30, 2012
Derivative Instruments (Tables) [Abstract]  
Impact of derivative instruments on the statement of operations and OCI
     Three Months Ended Nine Months Ended
     September 30, September 30,
   Location  2012  2011  2012  2011
Gain (loss) on interest rate swap recognized in n/a            
 OCI (effective portion)   $ 797 $ 658 $ 2,342 $ 2,499
Gain (loss) on interest rate swaps reclassified from  Interest expense            
 AOCI into income (effective portion)     383   467   1,204   1,440
Gain (loss) on interest rate swaps recognized Realized loss            
 in income     0   0   (96)   0
Gain (loss) on forward exchange contracts recognized in  Unrealized loss            
 income (ineffective portion and amount excluded              
 from effectiveness testing)     0   0   (555)   0
Gain (loss) on forward exchange contracts recognized Realized gain            
 in income (loss)   (409)   0   2,363   0
Gain (loss) on forward exchange contracts designated n/a            
 as net investment hedge recognized in OCI     (12,663)   0   (5,747)   0