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SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Impairment of Investment
Impairment charges related to investment in Terminal joint venture | $	$ 0.0	$ 0.0	$ 0.0
Long-lived Assets
Estimated fair value of inactive vessels | $		0.0
Capitalized Interest
Interest Costs Capitalized | $	$ 2.1	0.4	0.4
Dry-docking
Number of dry-docking inspections to be made within a specified period | item	2
Period within which number of specified dry-docking inspections to be made	5 years
Number of non-U.S. flag vessels in operations | item	6
Number of non-U.S. flag vessels owned | item	1
Number of non-U.S. flag vessels under bareboat charter | item	1
Dry-dock inspections interval, minimum	2 years
Dry-dock inspections interval, maximum	5 years
Vessels
Depreciation
Useful life	40 years
Machinery And Equipment
Depreciation
Useful life	20 years
Terminal Facilities
Depreciation
Useful life	35 years
Operating costs
Long-lived Assets
Impairment charges related to long-lived assets | $	$ 0.0	$ 2.1	$ 0.0

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount of interest capitalized during the period.

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Amount before tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss, attributable to parent entity.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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