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Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Hyundai Merchant Marine Co Ltd ("HMM") |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 38.00% | 38.00% | 40.00%
CMA CGM |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 36.00% | 36.00% | 35.00%
M/T Aristotelis |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Sale of vessel expenses included in liabilities |  | $ 538 |

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