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Financial Instruments - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Hyundai Merchant Marine Co Ltd ("HMM") |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 19.00% | 21.00% | 24.00%
Petroleo Brasileiro S.A. |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 18.00% |  |
CMA CGM |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 17.00% |  |
CMTC |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage | 15.00% | 29.00% | 38.00%
A.P. Moler-Maersk A.S. ("Maersk") |  |  |
Derivative Instruments Gain/ (Loss) [Line Items] |  |  |
Major customer percentage |  |  | 12.00%

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