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SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT AND OTHER (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Impairment of Investment |  |  |
Impairment charges related to investment in Terminal joint venture | $ 0.0 | $ 0.0 | $ 0.0
Capitalized Interest |  |  |
Interest Costs Capitalized | $ 18.7 | $ 7.5 | $ 2.1
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 |  |
Dry-dock inspections interval, minimum | 36 months |  |
Vessels |  |  |
Depreciation |  |  |
Useful life | 40 years |  |
Long-lived Assets |  |  |
Number of vesels under agreements for contstruction | item | 4 |  |
Capitalized Interest |  |  |
Interest Costs Capitalized | $ 12.8 |  |
Machinery And Equipment |  |  |
Depreciation |  |  |
Useful life | 30 years |  |
Terminal Facilities |  |  |
Depreciation |  |  |
Useful life | 35 years |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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