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ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2019
reporting_unit
recycling_market
lease
Jan. 31, 2019
Jun. 30, 2018
Property, Plant and Equipment [Line Items]      
Number of leases acquired through merger | lease 3    
Ownership percentage   28.90% 20.00%
Average period over which market price of scrap per ton is calculated 10 years    
Number of recycling markets | recycling_market 3    
Number of reporting units | reporting_unit 1    
Vessel      
Property, Plant and Equipment [Line Items]      
Estimated remaining economic useful life 25 years    
Other equipment      
Property, Plant and Equipment [Line Items]      
Estimated remaining economic useful life 5 years    
Minimum      
Property, Plant and Equipment [Line Items]      
Ownership percentage 20.00%    
Maximum      
Property, Plant and Equipment [Line Items]      
Ownership percentage 50.00%