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Voyage and Vessel Operating Expenses - Vessel Operating Expenses (Table) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Vessel operating expenses |  |  |
Crew wages and related costs | $ 14,498 | $ 12,938 | $ 12,348
Insurances | 2,655 | 2,399 | 2,195
Maintenance, Repairs, Spares and Stores | 6,779 | 6,130 | 4,729
Lubricants | 3,046 | 2,189 | 1,925
Tonnage taxes | 169 | 123 | 116
Upgrading Expenses | 19 | 789 | 301
Miscellaneous | 666 | 679 | 735
Total vessel operating expenses | $ 27,832 | $ 25,247 | $ 22,349

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