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Commitments and Contingencies - Future Commitments to Pay for Usage of Port Facilities (Details 2) - Port Facility Commitments
$ in Thousands
Dec. 31, 2015
USD ($)
Other Commitments [Line Items]  
2016 $ 33,217
2017 29,141
2018 20,403
2019 20,858
2020 21,326
Thereafter 60,889
Total $ 185,834