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Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Valuation Allowances and Reserves [Table Text Block]
   
Balance at
    
Charged to
                  
   
Beginning of
    
Costs and
            
Balance at
  
Description
  
Year
    
Expenses
    
Deductions
    
End of Year
  
Insurance and claims accruals:
                                
Year ended December 31, 2018
   $
26,177
     $
56,122
     $
(54,196
)
(1)
 		 $
28,103
  
Year ended December 31, 2017
    
19,440
      
53,609
      
(46,872
)
(1)
 		  
26,177
  
Year ended December 31, 2016
    
16,235
      
49,614
      
(46,409
)
(1)
 		  
19,440
  
                                 
                                 
Allowance for doubtful accounts:
                                
Year ended December 31, 2018
    
300
      
163
      
(115
)
(2)
 		  
348
  
Year ended December 31, 2017
    
275
      
33
      
(8
)
(2)
 		  
300
  
Year ended December 31, 2016
    
305
      
88
      
(118
)
(2)
 		  
275