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Port Access Contract Rights (Tables)
 12 Months Ended
Dec. 31, 2015
Port Access Rights and Related Transportation Contracts  
Port access contract rights
20152014
Port access rights$ 55,940 $ 53,780
Less: Accumulated amortization(3,710) —
Less: Impairments(52,230) —
Port access rights, net$ — $ 53,780