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Derivative Instruments (Tables)
3 Months Ended
Jun. 30, 2012
Derivative Instruments (Tables) [Abstract]  
Impact of derivative instruments on the statement of operations and OCI
     Three Months Ended Six Months Ended
     June 30, June 30,
   Location  2012  2011  2012  2011
Gain (loss) on interest rate swap recognized in              
 OCI (effective portion) n/a $ 806 $ (4,962) $ 1,545 $ (7,016)
Gain (loss) on interest rate swaps reclassified from               
 AOCI into income (effective portion) Interest expense   360   (794)   821   (1,598)
Gain (loss) on interest rate sawps recognized              
 in income Realized loss   (96)   0   (96)   0
Gain (loss) on forward exchange contracts recognized in               
 income (ineffective portion and amount excluded              
 from effectiveness testing) Unrealized loss   0   0   (555)   0
Gain (loss) on forward exchange contracts recognized              
 in income Realized gain   2,772   0   2,772   0
Gain (loss) on forward exchange contracts designated              
 as net investment hedge recognized in OCI n/a   6,916   0   6,916   0