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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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 20
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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