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Business Segment Information (Schedule Of Segment Information) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Segment Reporting Information [Line Items]        
Segment margin $ 141,340 $ 140,710 $ 428,707 $ 333,398
Total revenues 460,050 572,334 $ 1,284,440 1,755,518
Number of Reportable Segments | segment     5  
Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Total revenues 89,717 61,388 $ 244,837 63,436
Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Total revenues 13,999 19,909 48,400 57,910
Refinery services        
Segment Reporting Information [Line Items]        
Total revenues 45,725 43,332 129,585 135,780
Marine transportation        
Segment Reporting Information [Line Items]        
Total revenues 55,285 60,536 159,930 180,501
Supply and logistics        
Segment Reporting Information [Line Items]        
Total revenues 255,324 387,169 701,688 1,317,891
Sekco [Member] | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Capital Expenditures     0 2,500
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 141,340 140,710 428,707 333,398
Capital Expenditures 116,750 1,622,750 358,429 1,856,111
External customers 460,050 572,334 1,284,440 1,755,518
Operating Segments | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 86,557 70,943 249,457 121,241
Capital Expenditures 3,977 1,520,268 35,175 1,522,407
External customers 89,717 61,388 242,672 63,436
Operating Segments | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 10,603 14,984 38,370 43,670
Capital Expenditures 54,968 45,933 156,977 155,417
External customers 10,846 16,735 36,356 48,422
Operating Segments | Refinery services        
Segment Reporting Information [Line Items]        
Segment margin 20,526 20,692 61,586 60,073
Capital Expenditures 488 118 1,645 1,568
External customers 48,069 45,738 136,437 142,959
Operating Segments | Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin 16,697 26,583 53,695 79,501
Capital Expenditures 26,937 12,489 62,928 40,151
External customers 53,573 58,490 155,197 173,733
Operating Segments | Supply and logistics        
Segment Reporting Information [Line Items]        
Segment margin 6,957 7,508 25,599 28,913
Capital Expenditures 30,380 43,942 101,704 136,568
External customers 257,845 389,983 713,778 1,326,968
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment 0 0 0 0
Intersegment Eliminations | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment 0 0 2,165 0
Intersegment Eliminations | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment 3,153 3,174 12,044 9,488
Intersegment Eliminations | Refinery services        
Segment Reporting Information [Line Items]        
Intersegment (2,344) (2,406) (6,852) (7,179)
Intersegment Eliminations | Marine transportation        
Segment Reporting Information [Line Items]        
Intersegment 1,712 2,046 4,733 6,768
Intersegment Eliminations | Supply and logistics        
Segment Reporting Information [Line Items]        
Intersegment $ (2,521) $ (2,814) $ (12,090) $ (9,077)