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RELATED PARTY TRANSACTIONS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 GMC | Jun. 30, 2012 GMC | Dec. 31, 2012 GMC | Jun. 30, 2013 Constantine Georgiopoulos | Jun. 30, 2012 Constantine Georgiopoulos | Dec. 31, 2012 Constantine Georgiopoulos | Jun. 30, 2013 MEP | Jun. 30, 2012 MEP | Dec. 31, 2012 MEP | Jun. 30, 2013 Aegean | Jun. 30, 2012 Aegean | Dec. 31, 2012 Aegean
Related party transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from related party | $ 819 | $ 819 | $ 1,629 | $ 1,638 |  |  |  |  |  |  | $ 1,629 | $ 1,638 |  |  |  |
Expenses incurred from transactions with related party |  |  |  |  | 54 | 17 |  | 7 | 3 |  |  |  |  | 746 | 761 |
Amount due to the entity from a related party |  |  |  |  | 5 |  |  |  |  |  | 4 |  | 5 |  |  |
Amount due to the related party |  |  |  |  |  |  | 12 | 7 |  | 0 |  |  |  | 245 |  | 278
Amount invoiced for services performed and expenses paid |  |  |  |  | $ 75 | $ 98 |  |  |  |  | $ 1,708 | $ 1,682 |  |  |  |

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