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Long-term debt (Tables)
 6 Months Ended
Jun. 30, 2018
Long-term Debt, by Current and Noncurrent [Abstract]  
Long-term debt, Principal payments
Twelve month periods ending     Amount
June 30, 2019   $ 119,657
June 30, 2020     76,026
June 30, 2021     129,711
June 30, 2022     69,772
June 30, 2023     80,772
June 30, 2024 and thereafter     210,317
Total Long term debt   $ 686,255
Unamortized debt issuance costs     6,438
Total Long term debt, net   $ 679,817
Current portion of long term debt     119,657
Long term debt, net     560,160
Interest and finance costs
      Six months ended June 30,
      2017     2018
Interest on long term debt and capital leases   $ 23,008     $ 28,691  
Less: Interest capitalized     (1,260)       (468)  
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other Comprehensive Income (Note 13)     473       73  
Amortization of debt issuance costs     1,288       1,367  
Other bank and finance charges     257       675  
Interest and finance costs   $ 23,766   $ 30,338