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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-term Debt [Abstract] |
Long-term debt, Principal payments |
Twelve month periods ending |  |  | Amount
December 31, 2018 |  | $ | 173,958
December 31, 2019 |  |  | 268,745
December 31, 2020 |  |  | 75,665
December 31, 2021 |  |  | 132,152
December 31, 2022 |  |  | 57,880
December 31, 2023 and thereafter |  |  | 47,814
Total Long term debt |  | $ | 756,214
Unamortized debt issuance costs |  |  | 7,119
Total Long term debt, net |  | $ | 749,095
Current portion of long term debt |  |  | 173,958
Long term debt, net |  |  | 575,137
Interest and finance costs |
| 2015 |  |  | 2016 |  |  | 2017
Interest on long term debt and capital leases | $ | 35,969 |  | $ | 40,449 |  | $ | 48,814
Less: Interest capitalized |  | (12,079) |  |  | (3,940) |  |  | (2,423)
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other Comprehensive Income (Note 18) |  | 2,416 |  |  | 1,252 |  |  | 852
Amortization of debt issuance costs |  | 2,732 |  |  | 2,855 |  |  | 2,660
Other bank and finance charges |  | 623 |  |  | 601 |  |  | 555
Interest and finance costs | $ | 29,661 |  | $ | 41,217 |  | $ | 50,458

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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