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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
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,
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, 201
6
                                        
Allowance for uncollectable accounts (1)
   $
31,820
     $
7,982
     $
-
     $
(15,627
 )   $
24,175
  
Allowance for deferred tax asset
   $
27,905
     $
-
     $
67,221
     $
-
     $
95,126
  
                                         
Year Ended December 31, 2015
                                        
Allowance for uncollectable accounts (1)
   $
32,509
     $
11,174
     $
-
     $
(11,863
 )   $
31,820
  
Allowance for deferred tax asset
   $
34,302
     $
-
     $
(6,397
 )   $
-
     $
27,905
  
 
 
(1)
     Includes allowances on accounts receivable and straight-line rents.