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SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT (Details) $ in Millions | 12 Months Ended
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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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