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Business Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2015
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Segment information for the periods presented below was as follows:
| Onshore Pipeline Transportation |  | Offshore Pipeline Transportation |  | Refinery Services |  | Marine Transportation |  | Supply & Logistics |  | Total
Three Months Ended March 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Segment Margin (a) | $ | 14,323 |  |  | $ | 25,198 |  |  | $ | 19,160 |  |  | $ | 25,693 |  |  | $ | 9,747 |  |  | $ | 94,121 |
Capital expenditures (b) | $ | 68,591 |  |  | $ | 2,053 |  |  | $ | 1,212 |  |  | $ | 16,576 |  |  | $ | 36,776 |  |  | $ | 125,208 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External customers | $ | 15,831 |  |  | $ | 790 |  |  | $ | 48,435 |  |  | $ | 54,640 |  |  | $ | 407,161 |  |  | $ | 526,857 |
Intersegment (c) | 3,237 |  |  | — |  |  | (2,311 | ) |  | 2,731 |  |  | (3,657 | ) |  | — |
Total revenues of reportable segments | $ | 19,068 |  |  | $ | 790 |  |  | $ | 46,124 |  |  | $ | 57,371 |  |  | $ | 403,504 |  |  | $ | 526,857 |
Three Months Ended March 31, 2014 |  |  |  |  |  |  |  |  |  |  |
Segment Margin (a) | $ | 14,689 |  |  | $ | 13,403 |  |  | $ | 20,872 |  |  | $ | 20,457 |  |  | $ | 7,930 |  |  | $ | 77,351 |
Capital expenditures (b) | $ | 23,896 |  |  | $ | 10,384 |  |  | $ | 302 |  |  | $ | 10,959 |  |  | $ | 57,237 |  |  | $ | 102,778 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
External customers | $ | 15,503 |  |  | $ | 947 |  |  | $ | 57,107 |  |  | $ | 51,090 |  |  | $ | 895,072 |  |  | $ | 1,019,719 |
Intersegment (c) | 4,470 |  |  | — |  |  | (2,914 | ) |  | 5,203 |  |  | (6,759 | ) |  | — |
Total revenues of reportable segments | $ | 19,973 |  |  | $ | 947 |  |  | $ | 54,193 |  |  | $ | 56,293 |  |  | $ | 888,313 |  |  | $ | 1,019,719 |
Total assets by reportable segment were as follows:
| March 31, 2015 |  | December 31, 2014
Onshore pipeline transportation | $ | 491,072 |  |  | $ | 460,012 |
Offshore pipeline transportation | 637,412 |  |  | 645,668 |
Refinery services | 401,164 |  |  | 403,703 |
Marine transportation | 744,797 |  |  | 745,128 |
Supply and logistics | 934,699 |  |  | 907,189 |
Other assets | 62,996 |  |  | 68,674 |
Total consolidated assets | 3,272,140 |  |  | 3,230,374 |
(a) | A reconciliation of Segment Margin to net income for the periods is presented below.
(b) | Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of growth projects) as well as acquisitions of businesses and interests in equity investees. In addition to construction of growth projects, capital spending in our pipeline transportation segment included $1.8 million during the three months ended March 31, 2015 and $10.4 million during the three months ended March 31, 2014 representing capital contributions to our SEKCO equity investee to fund our share of the construction costs for its pipeline.
(c) | Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] | Reconciliation of Segment Margin to net income:
| Three Months Ended March 31,
| 2015 |  | 2014
Segment Margin | $ | 94,121 |  |  | $ | 77,351 |
Corporate general and administrative expenses | (12,299 | ) |  | (11,061 | )
Depreciation and amortization | (27,125 | ) |  | (19,280 | )
Interest expense | (19,215 | ) |  | (12,804 | )
Adjustment to exclude distributable cash generated by equity investees not included in income and include equity in investees net income (1) | (10,383 | ) |  | (5,777 | )
Non-cash items not included in Segment Margin | (2,614 | ) |  | 3,325 |
Cash payments from direct financing leases in excess of earnings | (1,362 | ) |  | (1,338 | )
Income tax expense | (908 | ) |  | (641 | )
Net income | 20,215 |  |  | 29,775 |
(1) | Includes distributions attributable to the quarter and received during or promptly following such quarter.

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, and discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
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