v3.20.4
LEASE ASSETS AND LIABILITIES Narrative 2 (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Operating Lease Type [Line Items]    
Operating lease, liability $ 85,789 $ 80,499
Operating lease, right-of-use asset $ 87,443 $ 81,219
Lessee, Finance Lease, Description [Abstract]    
Lessee, Finance Lease, Description The primary component of our finance lease portfolio is a dock at a terminal facility, which includes a commitment for minimum dockage and wharfage throughput volumes.  
Finance lease remaining term The dock lease has a remaining initial term of less than one year  
Number of renewal periods 4  
Lessee, finance lease, renewal term 5 years  
Land and dock leases [Member]    
Operating Lease Type [Line Items]    
Lessee, operating lease, description Our operating leases consist primarily of land and dock leases at various terminal facilities.  
Land and dock leases [Member] | Maximum [Member]    
Operating Lease Type [Line Items]    
Lessee, operating lease, remaining term 5 years  
Lessee, operating lease, renewal term 20 years  
Marine vessel leases [Member]    
Operating Lease Type [Line Items]    
Lessee, operating lease, description three leases for marine vessels at our Point Tupper terminal facility  
Lessee, operating lease, term of contract 5 years  
Operating lease, liability $ 20,100  
Operating lease, right-of-use asset $ 20,100