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OTHER LONG TERM ASSETS (Narrative) (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
vessel
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
vessel
Dec. 31, 2018
USD ($)
vessel
Property, Plant and Equipment [Line Items]        
Number of container vessels accounted for as right of use assets | vessel 7      
Other long term previously included in receivables $ 1,900,000      
Financing receivable, credit loss, expense     $ 1,900,000  
Financing receivable, allowance for credit loss $ 0   $ 0  
Construction in Progress        
Property, Plant and Equipment [Line Items]        
Number of vessels being upgraded | vessel 9   11  
Vessels and equipment | Cost        
Property, Plant and Equipment [Line Items]        
Capital improvements $ 12,623,000      
Construction completed        
Property, Plant and Equipment [Line Items]        
Number of vessels where upgrade completed | vessel 6      
Evergreen Marine | Container vessels        
Property, Plant and Equipment [Line Items]        
Number of container vessels accounted for as right of use assets | vessel       4
Charters value on aquisition       $ 18,000,000
Amortization $ 1,400,000 $ 1,400,000