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Business Segment Information (Schedule Of Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Segment margin $ 142,486 $ 98,567 $ 287,367 $ 192,688
Capital Expenditures 115,521 108,153    
External customers 445,976 656,327    
Intersegment 0 0    
Total revenues 445,976 656,327 824,390 1,183,184
Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 84,282 25,100    
Capital Expenditures 2,373 86    
External customers 76,829 1,258    
Intersegment 2,165 0    
Total revenues 78,994 1,258 155,120 2,048
Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 12,090 14,363    
Capital Expenditures 56,282 40,893    
External customers 10,634 15,856    
Intersegment 5,616 3,077    
Total revenues 16,250 18,933 34,401 38,001
Refinery services        
Segment Reporting Information [Line Items]        
Segment margin 19,861 20,221    
Capital Expenditures 832 238    
External customers 43,618 48,786    
Intersegment (2,294) (2,462)    
Total revenues 41,324 46,324 83,860 92,448
Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin 18,082 27,225    
Capital Expenditures 27,562 11,086    
External customers 50,964 60,603    
Intersegment 1,645 1,991    
Total revenues 52,609 62,594 104,645 119,965
Supply and logistics        
Segment Reporting Information [Line Items]        
Segment margin 8,171 11,658    
Capital Expenditures 28,472 55,850    
External customers 263,931 529,824    
Intersegment (7,132) (2,606)    
Total revenues $ 256,799 $ 527,218 446,364 930,722
Sekco [Member] | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Capital Expenditures     0 1,800
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin     287,367 192,688
Capital Expenditures     241,679 233,361
External customers     824,390 1,183,184
Operating Segments | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin     162,900 50,298
Capital Expenditures     31,198 2,139
External customers     152,955 2,048
Operating Segments | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin     27,767 28,686
Capital Expenditures     102,009 109,484
External customers     25,510 31,687
Operating Segments | Refinery services        
Segment Reporting Information [Line Items]        
Segment margin     41,060 39,381
Capital Expenditures     1,157 1,450
External customers     88,368 97,221
Operating Segments | Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin     36,998 52,918
Capital Expenditures     35,991 27,662
External customers     101,624 115,243
Operating Segments | Supply and logistics        
Segment Reporting Information [Line Items]        
Segment margin     18,642 21,405
Capital Expenditures     71,324 92,626
External customers     455,933 936,985
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment     0 0
Intersegment Eliminations | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment     2,165 0
Intersegment Eliminations | Onshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment     8,891 6,314
Intersegment Eliminations | Refinery services        
Segment Reporting Information [Line Items]        
Intersegment     (4,508) (4,773)
Intersegment Eliminations | Marine transportation        
Segment Reporting Information [Line Items]        
Intersegment     3,021 4,722
Intersegment Eliminations | Supply and logistics        
Segment Reporting Information [Line Items]        
Intersegment     $ (9,569) $ (6,263)