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Interest and Finance Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Borrowing costs [abstract]    
Interest (recovery) expense $ (1,179) $ 2,115
Finance fees 2,391 3,073
Accretion expense (Note 16) 5,973 4,363
Interest and finance expense $ 7,185 $ 9,551