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CONTRACTUAL OBLIGATIONS (Detail Textuals)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Newbuilding
Dec. 31, 2016
USD ($)
Newbuilding
Dec. 31, 2015
USD ($)
Disclosure Of Contractual Commitments [Abstract]      
Direct issuance costs for borrowings $ 4.8 $ 2.0  
Borrowing costs capitalized $ 3.5 $ 1.3  
Expected number of newbuildings to be delivered during 2018-2019 | Newbuilding 10 4  
Average period of redelivery of vessels 5 years 9 years  
Maximum mutually non-cancellable operating lease period 8 years    
Lease expense for Charter hire $ 8.5 $ 21.5 $ 12.0
Other operating lease expense $ 2.3 $ 2.2  
Average period until redelivery of the vessels 1 year 1 month 6 days 2 years 1 month 6 days