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Business Segment Information (Schedule of Total Assets By Reportable Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 5,702,592 | $ 5,459,599 | $ 3,210,624
Offshore Pipeline Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 2,575,335 | 2,623,478 | 645,668
Refinery Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 395,043 | 394,626 | 403,703
Marine Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 813,722 | 777,952 | 745,128
Supply And Logistics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 1,875,403 | 1,615,335 | 1,367,201
Other Assets [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 43,089 | $ 48,208 | $ 48,924

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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