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Notes Payable (Tables)
 12 Months Ended
Dec. 31, 2012
Notes Payable [Abstract]  
Summary of notes payable
                 
    2012     2011  

Revolving credit agreement average effective interest rate of 2.7% inclusive of unused fee

   $ 17,400     $ 23,500  

Promissory note payable in annual installments of $100 plus accrued interest through December 31, 2012, interest accrues at 3.25% per annum

     —         100  

Promissory note payable in annual installments of $50 plus accrued interest through December 21, 2012, interest accrues at 4.00% per annum

     —         50  

Promissory note payable in annual installments of $184 plus accrued interest through June 30, 2013, interest accrues at 3.25% per annum

     184       367  

Promissory note payable in annual installments of $100 plus accrued interest through July 25, 2013, interest accrues at 3.25% per annum

     100       200  

Promissory note payable in annual installments of $50 plus accrued interest through January 3, 2014, interest accrues at 3.25% per annum

     100       —    

Promissory notes payable in aggregate annual installments of $125 plus accrued interest through May 22, 2014, interest accrues at 3.25% per annum

     250       —    
   

 

 

    

 

 

  
      18,034       24,217  

Less current portion

     (459 )      (433 ) 
   

 

 

    

 

 

  
    $ 17,575     $ 23,784  
   

 

 

    

 

 

  
Summary of aggregate annual payments of principal required to revolving credit facility
         

During the twelve months ended December 31, 2013

   $ 459  

During the twelve months ended December 31, 2014

     175  

During the twelve months ended December 31, 2015

     17,400  
   

 

 

  
    $ 18,034