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Summary of Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Operations and Significant Accounting Policies [Abstract]  
Summary of Allowance for doubtful accounts

Our allowance for doubtful accounts activity is summarized as follows (in thousands):

 

                         
    2012     2011     2010  

Balance at January 1,

                        

Allowance for doubtful accounts

   $ 452     $ 374     $ 516  

Charges to expense

     195       100       150  

Write-offs of uncollectible accounts, net of recoveries

     (266 )      (22 )      (292 ) 

Balance at December 31,

                        
   

 

 

    

 

 

    

 

 

  

Allowance for doubtful accounts

   $ 381     $ 452     $ 374  
   

 

 

    

 

 

    

 

 

  
Summary of property, equipment and software over estimated useful life

Depreciation of property, equipment and software is calculated using either straight-line or accelerated methods over estimated useful lives of the related assets or lease terms, as follows:

 

     
    Years

Buildings

   39

Office furniture and fixtures

   7

Computer hardware and software

   3-10

Aircraft

   20

Leasehold improvements

   Life of lease
Summary of basic and diluted common shares outstanding

Basic and diluted shares outstanding are summarized as follows:

 

                         
    Year Ended December 31,  
    2012     2011     2010  

Weighted average number of basic shares outstanding

     7,722,733       10,082,528       10,332,685  

Effect of dilutive securities

     139,860       67,751       39,775  
   

 

 

    

 

 

    

 

 

  

Weighted average number of diluted shares outstanding

     7,862,593       10,150,279       10,372,460