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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Description
 
Balances at
Beginning of
Period
   
Charged to
Costs and
Expenses
   
Deductions(1)
   
Balances at
End of Period
 
                         
Allowance for doubtful accounts
                       
Year Ended December 31, 2011
  $ 72,868     $ 9,889     $ (45,347 )   $ 37,410  
Year Ended December 31, 2012
  $ 37,410     $ 89,033     $ (84,894 )   $ 41,548  

(1) Uncollectible accounts written off, net of recoveries.