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Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total consolidated assets | $ 5,665,811 | $ 5,459,599
Onshore pipeline transportation |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 668,740 | 614,484
Offshore pipeline transportation |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 2,622,230 | 2,623,478
Refinery services |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 389,292 | 394,626
Marine transportation |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 793,499 | 777,952
Supply and logistics |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 1,138,443 | 1,000,851
Other assets |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | $ 53,607 | $ 48,208

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