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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
 
 
Balance at
beginning of
period
 
 
Charged to
expenses
 
 
Adjustments to
valuation
accounts
 
 
Deductions
 
 
Balance at
end of
period
 
Year Ended December 31, 2016
                                        
Allowance for uncollectable accounts
   $
13,918
     $
5,249
     $
-
     $
(6,894
 )   $
12,273
  
Allowance for deferred tax asset
   $
27,905
     $
-
     $
67,221
     $
-
     $
95,126
  
                                         
Year Ended December 31, 2015
                                        
Allowance for uncollectable accounts
   $
10,368
     $
7,333
     $
-
     $
(3,783
 )   $
13,918
  
Allowance for deferred tax asset
   $
34,302
     $
-
     $
(6,397
 )   $
-
     $
27,905
  
                                         
Year Ended December 31, 2014
                                        
Allowance for uncollectable accounts
   $
10,771
     $
3,886
     $
-
     $
(4,289
 )   $
10,368
  
Allowance for deferred tax asset
   $
63,712
     $
-
     $
(29,410
 )   $
-
     $
34,302