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Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Valuation And Qualifying Accounts And Reserves [Table Text Block]
Description
  
Balance at
Beginning of
Year
    
Charged to
Costs and
Expenses
    
Deductions
    
Balance at
End of Year
  
Insurance and claims accruals:
                                
Year ended December 31, 2015
   $ 13,998     $ 45,271     $ (43,034 )
(1)
   $ 16,235  
Year ended December 31, 2014
     14,404       41,036       (41,442 )
(1)
     13,998  
Year ended December 31, 2013
     13,838       35,194       (34,628 )
(1)
     14,404  
                                 
                                 
Allowance for doubtful accounts:
                                
Year ended December 31, 2015
     475       59       (229 )
(2)
     305  
Year ended December 31, 2014
     450       264       (239 )
(2)
     475  
Year ended December 31, 2013
     334       225       (109 )
(2)
     450