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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
                                        
Allowance for uncollectable accounts (1)
   $
17,066
     $
9,254
     $
-
     $
(5,882
 )   $
20,438
  
Allowance for deferred tax asset
   $
54,155
     $
-
     $
(8,742
 )   $
-
     $
45,413
  
                                         
Year Ended December 31, 2017
                                        
Allowance for uncollectable accounts (1)
   $
24,175
     $
6,641
     $
-
     $
(13,750
 )   $
17,066
  
Allowance for deferred tax asset
   $
95,126
     $
-
     $
(40,971
 )   $
-
     $
54,155
  
                                         
Year Ended December 31, 2016
                                        
Allowance for uncollectable accounts (1)
   $
31,820
     $
7,982
     $
-
     $
(15,627
 )   $
24,175
  
Allowance for deferred tax asset
   $
27,905
     $
-
     $
67,221
     $
-
     $
95,126