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Other Liabilities (Tables)
6 Months Ended
Jun. 30, 2012
Other Liabilities [Abstract]  
Other liabilities
                 
    June 30,
2012
    December 31,
2011
 

Deferred compensation

  $ 11,417     $ 10,894  

Lease incentives

    29,907       29,999  

Deferred rent benefit

    27,487       25,862  

Other

    19,514       17,051  
   

 

 

   

 

 

 

Total other liabilities

  $ 88,325     $ 83,806