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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Segment margin $ 170,240 $ 138,645
Total revenues 725,808 415,491
Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Total revenues 73,260 85,128
Sodium minerals and sulfur services    
Segment Reporting Information [Line Items]    
Total revenues 285,910 45,046
Onshore Facilities & Transportation    
Segment Reporting Information [Line Items]    
Total revenues 317,709 235,015
Marine transportation    
Segment Reporting Information [Line Items]    
Total revenues 48,929 50,302
Operating Segments    
Segment Reporting Information [Line Items]    
Segment margin 170,240 138,645
Capital Expenditures 44,507 58,987
External customers 725,808 415,491
Operating Segments | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Segment margin 73,173 87,089
Capital Expenditures 654 2,239
External customers 73,260 85,405
Operating Segments | Sodium minerals and sulfur services    
Segment Reporting Information [Line Items]    
Segment margin 64,391 17,496
Capital Expenditures 9,699 513
External customers 287,403 47,271
Operating Segments | Onshore Facilities & Transportation    
Segment Reporting Information [Line Items]    
Segment margin 21,689 21,097
Capital Expenditures 23,289 46,702
External customers 320,215 234,611
Operating Segments | Marine transportation    
Segment Reporting Information [Line Items]    
Segment margin 10,987 12,963
Capital Expenditures 10,865 9,533
External customers 44,930 48,204
Intersegment    
Segment Reporting Information [Line Items]    
Intersegment 0 0
Intersegment | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Intersegment 0 (277)
Intersegment | Sodium minerals and sulfur services    
Segment Reporting Information [Line Items]    
Intersegment (1,493) (2,225)
Intersegment | Onshore Facilities & Transportation    
Segment Reporting Information [Line Items]    
Intersegment (2,506) 404
Intersegment | Marine transportation    
Segment Reporting Information [Line Items]    
Intersegment $ 3,999 $ 2,098