SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Segment Information | ||
| Total assets | $ 6,646,969 | $ 6,535,233 |
| Other Partnership Assets | ||
| Segment Information | ||
| Total assets | 192,850 | 188,507 |
| Operating Segments [Member] | ||
| Segment Information | ||
| Total assets | 6,454,119 | 6,346,726 |
| Operating Segments [Member] | Pipeline Segment | ||
| Segment Information | ||
| Total assets | 3,581,710 | 3,492,417 |
| Operating Segments [Member] | Storage Segment | ||
| Segment Information | ||
| Total assets | 2,754,290 | 2,735,563 |
| Operating Segments [Member] | Fuels Marketing Segment | ||
| Segment Information | ||
| Total assets | $ 118,119 | $ 118,746 |