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Leases (Bareboat and Time Charters-In) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Bareboat Charters-In [Member]  
Leases [Line Items]  
2018 $ 1,582
2019 6,278
2020 6,295
2021 6,278
2022 6,278
Thereafter 6,828
Net minimum lease payments $ 33,539
2018, operating days 184 days
2019, operating days 730 days
2020, operating days 732 days
2021, operating days 730 days
2022, operating days 730 days
Thereafter, operating days 794 days
Operating days, total 3900 days
Time Charters-In [Member]  
Leases [Line Items]  
2018 $ 6,413
2019 5,504
Net minimum lease payments $ 11,917
2018, operating days 694 days
2019, operating days 529 days
Operating days, total 1223 days