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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts

(6) Valuation and Qualifying Accounts

       
  Balance at
Beginning of
Period		   Additions
Charged to
Costs and
Expenses		   Deductions /
Write-Offs		   Balance at
End of Period
For the year ended December 31, 2011 Allowance for doubtful accounts   $ 561     $ 290     $ (163 )    $ 688  
For the year ended December 31, 2010 Allowance for doubtful accounts   $ 395     $ 166     $ —     $ 561  
For the year ended December 31, 2009 Allowance for doubtful accounts   $ 340     $ 68     $ (13 )    $ 395