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Business and Segment Reporting (Reconciliation of Time Charter Revenue to Shipping Revenues) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business and Segment Reporting [Abstract]        
Time charter equivalent revenues $ 50,012 $ 69,280 $ 98,813 $ 153,412
Add: Voyage expenses 6,897 2,677 10,074 7,295
Shipping revenues $ 56,909 $ 71,957 $ 108,887 $ 160,707