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FREIGHT RECEIVABLES (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of financial assets that are either past due or impaired [line items]        
Total net $ 0 $ 500,000 $ 200,000  
Gross        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 72,600 65,100 84,800  
Provision for impairment of freight receivables        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 1,300,000 2,600,000 1,700,000 $ 0
Financial assets neither past due nor impaired | Gross        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 25,500,000 28,700,000 40,300,000  
Financial assets past due but not impaired | Due before 30 days | Gross        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 26,000,000 13,000,000 22,800,000  
Financial assets past due but not impaired | Due between 30 and 180 days | Gross        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net 18,400,000 18,700,000 16,400,000  
Financial Assets Past Due And Impaired | Due after 180 days | Gross        
Disclosure of financial assets that are either past due or impaired [line items]        
Total net $ 2,700,000 $ 4,700,000 $ 5,300,000