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Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 22, 2017
Financial Instruments - Additional Information [Abstract]        
Vessel's carrying amount       $ 32,144
Hyundai Merchant Marine Co Ltd ("HMM")        
Derivative Instruments Gain/ (Loss) [Line Items]        
Major customer percentage 18.00% 19.00% 21.00%  
Petroleo Brasileiro S.A.        
Derivative Instruments Gain/ (Loss) [Line Items]        
Major customer percentage 19.00% 18.00%    
CMA CGM        
Derivative Instruments Gain/ (Loss) [Line Items]        
Major customer percentage 17.00% 17.00%    
CMTC        
Derivative Instruments Gain/ (Loss) [Line Items]        
Major customer percentage 18.00% 15.00% 29.00%