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Business Segment Information (Schedule Of Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Segment margin $ 144,881 $ 94,121
Total revenues 378,414 526,857
Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Total revenues 76,126 790
Onshore pipeline transportation    
Segment Reporting Information [Line Items]    
Total revenues 18,151 19,068
Refinery services    
Segment Reporting Information [Line Items]    
Total revenues 42,536 46,124
Marine transportation    
Segment Reporting Information [Line Items]    
Total revenues 52,036 57,371
Supply and logistics    
Segment Reporting Information [Line Items]    
Total revenues 189,565 403,504
Sekco [Member] | Onshore pipeline transportation    
Segment Reporting Information [Line Items]    
Capital Expenditures   1,800
Operating Segments    
Segment Reporting Information [Line Items]    
Segment margin 144,881 94,121
Capital Expenditures 126,158 125,208
External customers 378,414 526,857
Operating Segments | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Segment margin 78,618 25,198
Capital Expenditures 28,825 2,053
External customers 76,126 790
Operating Segments | Onshore pipeline transportation    
Segment Reporting Information [Line Items]    
Segment margin 15,677 14,323
Capital Expenditures 45,727 68,591
External customers 14,876 15,831
Operating Segments | Refinery services    
Segment Reporting Information [Line Items]    
Segment margin 21,199 19,160
Capital Expenditures 325 1,212
External customers 44,750 48,435
Operating Segments | Marine transportation    
Segment Reporting Information [Line Items]    
Segment margin 18,916 25,693
Capital Expenditures 8,429 16,576
External customers 50,660 54,640
Operating Segments | Supply and logistics    
Segment Reporting Information [Line Items]    
Segment margin 10,471 9,747
Capital Expenditures 42,852 36,776
External customers 192,002 407,161
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Intersegment 0 0
Intersegment Eliminations | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Intersegment 0 0
Intersegment Eliminations | Onshore pipeline transportation    
Segment Reporting Information [Line Items]    
Intersegment 3,275 3,237
Intersegment Eliminations | Refinery services    
Segment Reporting Information [Line Items]    
Intersegment (2,214) (2,311)
Intersegment Eliminations | Marine transportation    
Segment Reporting Information [Line Items]    
Intersegment 1,376 2,731
Intersegment Eliminations | Supply and logistics    
Segment Reporting Information [Line Items]    
Intersegment $ (2,437) $ (3,657)