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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]  
Components of accumulated other comprehensive income (loss)
                 
    2012     2011  

Net unrealized loss on marketable investments, net of taxes

   $ (1,024 )    $ (1,021 ) 

Cumulative translation adjustment

     1,612       (5,807 ) 
   

 

 

    

 

 

  

Total accumulated other comprehensive income (loss)

   $ 588     $ (6,828 ) 
   

 

 

    

 

 

  
Stock-based compensation expense
                         
    Years Ended December 31,  
    2012     2011     2010  

Cost of services and fulfillment

   $ 3,085     $ 1,644     $ 2,094  

Selling and marketing

     894       751       943  

General and administrative

     1,418       1,247       1,837  
   

 

 

    

 

 

    

 

 

  

Total

   $ 5,397     $ 3,642     $ 4,874  
   

 

 

    

 

 

    

 

 

  
Options granted under the equity incentive plans and shares subject to the employee stock purchase plan valuation assumptions
                                                 
    Years Ended December 31,  
    2012     2011     2010  
    Equity Incentive
Plans		     Employee Stock
Purchase Plan		     Equity Incentive
Plans		     Employee Stock
Purchase Plan		     Equity Incentive
Plans		     Employee Stock
Purchase Plan		  

Average risk-free interest rate

     0.85 %      0.14 %      1.25 %      0.13 %      1.93 %      0.17 % 

Expected dividend yield

     1.7 %      1.7 %      None       None       None       None  

Expected life

     4.5 Years       0.5 Years       3.5 Years       0.5 Years       3.6 Years       0.5 Years  

Expected volatility

     40 %      31 %      40 %      28 %      40 %      25 % 

Weighted average fair value

   $ 9.64     $ 6.90     $ 10.47     $ 7.55     $ 9.67     $ 6.38  
Depreciation and amortization of property and equipment, useful life
     
   

Estimated
    Useful Life

Computers and equipment

   3 to 10 Years

Computer software

   3 to 5 Years

Furniture and fixtures

   7 Years

Leasehold improvements

   Shorter of asset life or lease term
Amortization of intangible assets, useful life
     
   

Estimated
Useful Life

Customer relationships

   5 to 11 Years

Research content

   1 to 2 Years

Technology

   7 Years

Trademarks

   1 Year

Backlog

   1 Year
Summary of basic and diluted weighted average common shares
                         
    Years Ended December 31,  
    2012     2011     2010  

Basic weighted average common shares outstanding

     22,500       22,666       22,478  

Weighted average common equivalent shares

     429       498       585  
   

 

 

    

 

 

    

 

 

  

Diluted weighted average common shares outstanding

     22,929       23,164       23,063