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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Derivative Instruments (Tables) [Abstract]  
Impact of derivative instruments on the statement of operations and OCI
     Year Ended
   Location December 31, 2012 December 31, 2011 December 31, 2010
Gain (loss) on interest rate swap recognized in OCI (effective portion) OCI $ 3,200 $ 3,189 $ (10,307)
Gain (loss) on interest rate swaps reclassified from AOCI into income (effective portion) Interest expense   (1,596)   1,781   (2,244)
Gain (loss) on forward exchange contracts recognized in income  Realized gain   1,921   0   0
Gain (loss) on interest rate swaps recognized in income Realized loss   (96)   0   0
Gain (loss) on forward exchange contracts designated as net investment hedge recognized in OCI OCI   (5,134)   0   0