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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels and Depreciation (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]  
Vessels Salvage Value Per Lightweight Ton $ 300
Vessels | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 25 years
Vessels | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 30 years
Current Fleet [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 2 years
Current Fleet [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 23 years