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Business Segment Information (Schedule Of Segment Information) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Segment Reporting [Abstract]        
Number of Reportable Segments | segment     4  
Segment Reporting Information [Line Items]        
Segment margin $ 134,000 $ 142,486 $ 272,645 $ 287,367
Total revenues 406,723 445,976 822,214 824,390
Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Total revenues 77,638 78,994 162,766 155,120
Refinery services        
Segment Reporting Information [Line Items]        
Total revenues 43,068 41,324 88,114 83,860
Marine transportation        
Segment Reporting Information [Line Items]        
Total revenues 53,202 52,609 103,504 104,645
Onshore facilities and transportation        
Segment Reporting Information [Line Items]        
Total revenues 232,815 273,049 467,830 480,765
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 134,000 142,486 272,645 287,367
Capital Expenditures 57,850 115,521 116,837 241,679
External customers 406,723 445,976 822,214 824,390
Operating Segments | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 78,211 84,282 165,300 162,900
Capital Expenditures 3,903 2,373 6,142 31,198
External customers 78,577 76,829 163,982 152,955
Operating Segments | Refinery services        
Segment Reporting Information [Line Items]        
Segment margin 16,337 19,861 33,833 41,060
Capital Expenditures 432 832 945 1,157
External customers 45,210 43,618 92,481 88,368
Operating Segments | Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin 14,156 18,082 27,119 36,998
Capital Expenditures 11,132 27,562 20,665 35,991
External customers 49,311 50,964 97,515 101,624
Operating Segments | Onshore facilities and transportation        
Segment Reporting Information [Line Items]        
Segment margin 25,296 20,261 46,393 46,409
Capital Expenditures 42,383 84,754 89,085 173,333
External customers 233,625 274,565 468,236 481,443
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment 0 0 0 0
Intersegment Eliminations | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment (939) 2,165 (1,216) 2,165
Intersegment Eliminations | Refinery services        
Segment Reporting Information [Line Items]        
Intersegment (2,142) (2,294) (4,367) (4,508)
Intersegment Eliminations | Marine transportation        
Segment Reporting Information [Line Items]        
Intersegment 3,891 1,645 5,989 3,021
Intersegment Eliminations | Onshore facilities and transportation        
Segment Reporting Information [Line Items]        
Intersegment $ (810) $ (1,516) $ (406) $ (678)