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CAPITAL LEASE OBLIGATION, Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2015
vessel
Dec. 31, 2018
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 27, 2018
vessel
Sep. 30, 2018
containership
May 31, 2018
containership
Other Long-term Liabilities [Line Items]                
Number of container vessels contracted to be chartered in | vessel 2         2    
Term of lease or charter 15 years   7 years   15 years      
Capital Leased Assets, Number of Units               4
Interest incurred on capital leases | $     $ 31.5 $ 8.6 $ 21.8      
Number of year before option to buy vessel is available   6     6      
10,600 TEU Containership [Member]                
Other Long-term Liabilities [Line Items]                
Capital Leased Assets, Number of Units             3  
Minimum [Member]                
Other Long-term Liabilities [Line Items]                
Term of lease or charter   6 years 5 years          
Maximum [Member]                
Other Long-term Liabilities [Line Items]                
Term of lease or charter   11 years