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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Vessel operating expenses |  |  |
Crew wages and related costs | $ 62,920 | $ 65,402 | $ 29,449
Insurances | 6,124 | 8,026 | 4,561
Maintenance, repairs, spares and stores | 17,194 | 18,577 | 9,415
Lubricants | 6,372 | 8,187 | 3,901
Tonnage taxes | 2,438 | 3,717 | 1,360
Upgrading expenses | 1,784 | 6,205 | 3,167
Miscellaneous | 1,998 | 2,682 | 1,243
Total vessel operating expenses | $ 98,830 | $ 112,796 | $ 53,096

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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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