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Business Segment Information (Schedule Of Segment Information) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Segment margin $ 138,645 $ 144,881
Total revenues $ 415,491 378,414
Number of Reportable Segments | segment 4  
Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Total revenues $ 85,128 76,126
Refinery services    
Segment Reporting Information [Line Items]    
Total revenues 45,046 42,536
Marine transportation    
Segment Reporting Information [Line Items]    
Total revenues 50,302 52,036
Supply and logistics    
Segment Reporting Information [Line Items]    
Total revenues 235,015 207,716
Operating Segments    
Segment Reporting Information [Line Items]    
Segment margin 138,645 144,881
Capital Expenditures 58,987 126,158
External customers 415,491 378,414
Operating Segments | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Segment margin 87,089 78,618
Capital Expenditures 2,239 28,825
External customers 85,405 76,126
Operating Segments | Refinery services    
Segment Reporting Information [Line Items]    
Segment margin 17,496 21,199
Capital Expenditures 513 325
External customers 47,271 44,750
Operating Segments | Marine transportation    
Segment Reporting Information [Line Items]    
Segment margin 12,963 18,916
Capital Expenditures 9,533 8,429
External customers 48,204 50,660
Operating Segments | Supply and logistics    
Segment Reporting Information [Line Items]    
Segment margin 21,097 26,148
Capital Expenditures 46,702 88,579
External customers 234,611 206,878
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Intersegment 0 0
Intersegment Eliminations | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Intersegment (277) 0
Intersegment Eliminations | Refinery services    
Segment Reporting Information [Line Items]    
Intersegment (2,225) (2,214)
Intersegment Eliminations | Marine transportation    
Segment Reporting Information [Line Items]    
Intersegment 2,098 1,376
Intersegment Eliminations | Supply and logistics    
Segment Reporting Information [Line Items]    
Intersegment $ 404 $ 838