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Interest Rate Swap Agreements (Tables)
 6 Months Ended
Jun. 30, 2011
Interest Rate Swap Agreements (Tables) [Abstract]  
Interest rate swap agreements designated as hedge agreements
                                                 
                                            Estimated  
    Amount     Effective     Pay     Receive     Expiration     Fair Value at  
Category   Hedged     Date     Rate     Rate     Date     June 30, 2011  
Interest Rate Swap Assets                                        
 
  $ 175,000     December 2010     1.4000 %   1-Month LIBOR   September 2015     $ 1,500  
 
  $ 175,000     December 2010     1.3975 %   1-Month LIBOR   September 2015       1,443  
 
                                             
 
                                          $ 2,943  
 
                                             
Interest Rate Swap Liabilities                                        
 
  $ 106,632  (3)   August 2007     4.9220 %   3-Month LIBOR   August 2012   $ (6,415 )
 
  $ 149,285  (4)   November 2008     3.6300 %   1-Month LIBOR   (1)       (4,537 ) (2)
 
                                             
 
                                          $ (10,952 )
 
                                             
 
                                             
Total
  $ 605,917                                          
 
                                             
 
(1)   $85,310 of this swap expires November 2011 and $63,975 expires November 2012.
 
(2)   Approximately $1,266 is reflected in other current liabilities on the condensed consolidated balance sheet as of June 30, 2011.
 
(3)   An additional $18,368 of this original $125,000 swap is no longer designated as a hedge as a result of the prepayment of the unextended portion of the Company’s term loan debt.
 
(4)   An additional $25,715 of this original $175,000 swap is no longer designated as a hedge as a result of the prepayment of the unextended portion of the Company’s term loan debt. $14,690 of this additional amount expires November 2011 and $11,025 expires November 2012.