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Transactions With Related Parties - Additional Information - Interchart (Details) - Interchart Shipping Inc. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2014 | Apr. 01, 2014
Related Party Transaction [Line Items] |  |  |
Acquisition date | Feb. 25, 2014 |  |
Percentage of total outstanding common shares |  | 33.00% |
Payment to acquire business |  | $ 200 |
Shares to acquire business |  | 4,520 |
Fair value per share transferred |  |  | $ 72.55
New Services Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Monthly lump sum fee | $ 275 |  |
Expiration date of agreement | Dec. 31, 2018 |  |

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