| Schedule of intangible assets |
| | | | | | | | | | Intangible assets | | June 30, 2018 | | | December 31, 2017 | | | Acquisition cost (*) | | $ | 190,212 | | | $ | 200,610 | | | Accumulated amortization | | | (76,522) | | | | (73,790 | ) | | Write offs | | | — | | | | (10,398 | ) | | Total Intangible assets net book value | | $ | 113,690 | | | $ | 116,422 | | | | | | | | | | | | | (*) | As of both June 30, 2018 and December 31, 2017, intangible assets associated with the favorable lease terms included an amount of $1,150 related to purchase options for the vessels. | | | | | | | | | | | |
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