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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Jul. 24, 2014
Number of vessels 34  
Master Agreement    
Number of vessels 5 5
Outstanding Purchase Commitment $ 73,759  
Due date of commitment February 2016  
Master Agreement | Remaining new building vessels    
Number of vessels 1