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Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)
 12 Months Ended
Dec. 31, 2017
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, 201
7
   $
19,440
     $
53,609
     $
(46,872
)
(1)
   $
26,177
  
Year ended December 31, 201
6
    
16,235
      
49,614
      
(46,409
)
(1)
    
19,440
  
Year ended December 31, 201
5
    
13,998
      
45,271
      
(43,034
)
(1)
    
16,235
  
                                 
                                 
Allowance for doubtful accounts:
                                
Ye
ar ended December 31, 2017
    
275
      
33
      
(8
)
(2)
    
300
  
Year ended December 31, 201
6
    
305
      
88
      
(118
)
(2)
    
275
  
Year ended December 31, 201
5
    
475
      
59
      
(229
)
(2)
    
305