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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 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     June 30, 2011     June 30, 2010  
Interest rate swap
  Interest expense, net   $ (636 )   $ (2,630 )
Hedged item — debt
  Interest expense, net     270       2,380  
 
                   
 
          $ (366 )   $ (250 )
 
                   
 
    Location of     Amount of (gain) loss recognized  
    (gain) loss     Six Months Ended     Six Months Ended  
    recognized     June 30, 2011     June 30, 2010  
Interest rate swap
  Interest expense, net   $ (120 )   $ (1,515 )
Hedged item — debt
  Interest expense, net     (621 )     1,888  
 
                 
 
          $ (741 )   $ 373