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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Derivative Financial Instruments [Abstract] 
Location and effect of the derivative instrument on the statements of operations
                         
             
    Location of   Amount of (gain) loss recognized  
    (gain) loss   Three Months Ended     Three Months Ended  
    recognized   September 30, 2011     September 30, 2010  
Interest rate swap
  Interest expense, net   $ 350     $ (1,422 )
Hedged item — debt
  Interest expense, net     (788 )     806  
 
                   
 
          $ (438 )   $ (616 )
 
                   
                         
    Location of   Amount of (gain) loss recognized  
    (gain) loss   Nine Months Ended     Nine Months Ended  
    recognized   September 30, 2011     September 30, 2010  
Interest rate swap
  Interest expense, net   $ 230     $ (2,937 )
Hedged item — debt
  Interest expense, net     (1,409 )     2,693  
 
                   
 
          $ (1,179 )   $ (244 )