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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Segment margin	$ 169,288	$ 173,564
Total revenues	539,923	620,009
Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	78,429	78,317
Sodium Minerals & Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	243,390	275,486
Onshore Facilities & Transportation
Segment Reporting Information [Line Items]
Total revenues	155,758	209,556
Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	62,346	56,650
Operating Segments
Segment Reporting Information [Line Items]
Segment margin	169,288	173,564
Capital expenditures	31,391	33,167
Total revenues	539,923	620,009
Operating Segments | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Segment margin	85,246	76,390
Capital expenditures	1,027	458
Total revenues	78,429	78,317
Operating Segments | Sodium Minerals & Sulfur Services
Segment Reporting Information [Line Items]
Segment margin	36,941	58,639
Capital expenditures	14,975	22,706
Total revenues	245,535	277,349
Operating Segments | Onshore Facilities & Transportation
Segment Reporting Information [Line Items]
Segment margin	28,099	25,603
Capital expenditures	1,157	775
Total revenues	156,799	211,025
Operating Segments | Marine Transportation
Segment Reporting Information [Line Items]
Segment margin	19,002	12,932
Capital expenditures	14,232	9,228
Total revenues	59,160	53,318
Intersegment
Segment Reporting Information [Line Items]
Total revenues	0	0
Intersegment | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	0	0
Intersegment | Sodium Minerals & Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	(2,145)	(1,863)
Intersegment | Onshore Facilities & Transportation
Segment Reporting Information [Line Items]
Total revenues	(1,041)	(1,469)
Intersegment | Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	$ 3,186	$ 3,332

X

- Definition

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Revenues less product costs, operating expenses (excluding non-cash charges such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. Also excludes the non-cash effects of our stock appreciation rights compensation plan and includes the non-income portion of payments received under direct financing leases.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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