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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property and Equipment [Abstract]  
Components of property and equipment
                 
    December 31,  
    2012     2011  

Furniture and equipment

  $ 9,008     $ 9,275  

Leasehold improvements

    4,880       3,138  

Capitalized leases

    238       826  

Aircraft

    190       190  
   

 

 

   

 

 

 
      14,316       13,429  

Less: Accumulated depreciation

    (9,660     (10,114
   

 

 

   

 

 

 

Property and equipment, net

  $ 4,656     $ 3,315