Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total Segment Margin	$ 207,897	$ 196,190	$ 617,644	$ 572,914
Revenues	807,618	721,248	2,402,892	2,074,920
Preferred Distribution Rate Reset Election
Segment Reporting Information [Line Items]
Amount of Gain (Loss) Recognized in Income	12,300		17,700	(2,500)
Preferred Distribution Rate Reset Election | Other Expense [Member]
Segment Reporting Information [Line Items]
Amount of Gain (Loss) Recognized in Income		25,000
Offshore pipeline transportation
Segment Reporting Information [Line Items]
Revenues	106,297	89,805	289,151	239,958
Soda and sulfur services
Segment Reporting Information [Line Items]
Revenues	423,575	312,681	1,331,078	916,963
Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	197,526	240,967	541,874	708,110
Marine transportation
Segment Reporting Information [Line Items]
Revenues	80,220	77,795	240,789	209,889
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Margin	207,897	196,190	617,644	572,914
Capital expenditures	205,183	151,768	419,553	313,470
Revenues	807,618	721,248	2,402,892	2,074,920
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Total Segment Margin	109,267	91,402	300,505	281,286
Capital expenditures	149,489	86,893	293,187	166,703
Revenues	101,985	89,805	284,839	239,958
Operating Segments | Soda and sulfur services
Segment Reporting Information [Line Items]
Total Segment Margin	61,957	80,067	217,319	219,143
Capital expenditures	36,502	49,452	83,109	114,698
Revenues	425,913	315,334	1,337,897	924,534
Operating Segments | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Total Segment Margin	9,547	9,442	21,242	27,496
Capital expenditures	6,696	848	10,714	3,365
Revenues	199,500	238,483	539,367	700,909
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
Total Segment Margin	27,126	15,279	78,578	44,989
Capital expenditures	12,496	14,575	32,543	28,704
Revenues	80,220	77,626	240,789	209,519
Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Revenues	4,312	0	4,312	0
Intersegment | Soda and sulfur services
Segment Reporting Information [Line Items]
Revenues	(2,338)	(2,653)	(6,819)	(7,571)
Intersegment | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	(1,974)	2,484	2,507	7,201
Intersegment | Marine transportation
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 169	$ 0	$ 370