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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2011
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
   
Beginning
Balance
   
Charged to
Costs and
Expenses
 
Deductions
   
Acquisitions
 
Ending
Balance
 
Year ended December 31, 2009
                               
Allowance for doubtful accounts
 
$
301
 
$
226
  $
(208
)
$
113
 
$
432
 
                                 
Year ended December 31, 2010
                               
Allowance for doubtful accounts
 
 
432
   
173
   
(109
)
 
319
 
 
815
 
                                 
Year ended December 31, 2011
                               
Allowance for doubtful accounts
 
$
815
 
$
2,297
 
$
(450
)
$
—
 
$
2,662