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Voyage and Vessel operating expenses - Vessel operating expenses (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Vessel operating expenses |  |  |
Crew wages and related costs | $ 63,074 | $ 62,920 | $ 65,402
Insurances | 6,314 | 6,124 | 8,026
Maintenance, repairs, spares and stores | 18,589 | 17,194 | 18,577
Lubricants | 7,016 | 6,372 | 8,187
Tonnage taxes | 2,565 | 2,438 | 3,717
Upgrading expenses | 1,925 | 1,784 | 6,205
Miscellaneous | 1,945 | 1,998 | 2,682
Total vessel operating expenses | $ 101,428 | $ 98,830 | $ 112,796

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- Definition The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
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