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INVESTMENTS IN DIRECT FINANCING AND SALES-TYPE LEASES (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2015
Dec. 31, 2018
vessel
Jun. 30, 2019
USD ($)
containership
Dec. 31, 2018
vessel
Jun. 30, 2019
vessel
Jun. 30, 2019
Apr. 30, 2019
Rate
Jul. 31, 2018
Rate
Net Investment in Direct Financing and Sales Type Leases [Abstract]                
Number of VLCC crude tankers accounted for as direct financing leases   3   3 3      
Term of charters, minimum (in years)     6 years          
Term of charters, maximum (in years)     8 years          
Number of offshore supply vessels chartered on long-term bareboat charters         1      
Number of offshore support vessels for which company will receive 50% of agreed charter         2      
Subsequent Event [Line Items]                
Term of lease or charter 15 years   7 years 15 years        
Property, Plant and Equipment, Transfers and Changes | $     $ 27.0          
Agreed Proportion of temporary reduction to daily charter rate | Rate             100.00% 50.00%
MSC [Member]                
Subsequent Event [Line Items]                
Term of lease or charter     5 years          
Number of Container Vessels transferred from Vessels to Finance Lease Asset           2    
Number of container vessels     29   19      
Minimum [Member]                
Subsequent Event [Line Items]                
Term of lease or charter   6 years 5 years          
Four Container Vessels | MSC [Member]                
Subsequent Event [Line Items]                
Term of lease or charter     15 years