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SCHEDULE - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE - Valuation and Qualifying Accounts

Valuation and Qualifying Accounts

 
    
   Additions    
    
  
Description
  Balance at
Beginning
of Period		   Charged to
Costs and
Expenses		   Charged to
other account
describe		   Deductions
Describe(a)		   Balance
at end
of Period		  

Year ended December 31, 2012:

                                

Deducted from asset accounts:

                                

Allowance for doubtful accounts

     448,119     190,032           257,443     380,708  

Year ended December 31, 2011:

                                

Deducted from asset accounts:

                                

Allowance for doubtful accounts

     482,518     265,807           300,206     448,119  

Year ended December 31, 2010:

                                

Deducted from asset accounts:

                                

Allowance for doubtful accounts

     475,684     374,597           367,763     482,518  
(a)
Uncollectible accounts written off