Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total Segment Margin	$ 214,618	$ 219,272	$ 409,747	$ 376,724
Revenues	804,662	721,725	1,595,274	1,353,672
Preferred Distribution Rate Reset Election
Segment Reporting Information [Line Items]
Amount of Gain (Loss) Recognized in Income	(2,900)		(30,000)	3,800
Preferred Distribution Rate Reset Election | Other Expense [Member]
Segment Reporting Information [Line Items]
Amount of Gain (Loss) Recognized in Income		10,700
Offshore pipeline transportation
Segment Reporting Information [Line Items]
Revenues	91,459	82,085	182,854	150,153
Soda and sulfur services
Segment Reporting Information [Line Items]
Revenues	462,855	318,608	907,503	604,282
Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	173,005	244,712	344,348	467,143
Marine transportation
Segment Reporting Information [Line Items]
Revenues	77,343	76,320	160,569	132,094
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Margin	214,618	219,272	409,747	376,724
Capital expenditures	131,345	89,139	214,370	161,702
Revenues	804,662	721,725	1,595,274	1,353,672
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Total Segment Margin	93,300	118,980	191,238	189,884
Capital expenditures	91,645	44,369	143,698	79,810
Revenues	91,459	82,085	182,854	150,153
Operating Segments | Soda and sulfur services
Segment Reporting Information [Line Items]
Total Segment Margin	89,255	71,701	155,362	139,076
Capital expenditures	26,622	38,920	46,607	65,246
Revenues	465,077	321,192	911,983	609,200
Operating Segments | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Total Segment Margin	6,305	11,018	11,695	18,054
Capital expenditures	2,088	1,780	4,018	2,517
Revenues	170,783	242,131	339,868	462,426
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
Total Segment Margin	25,758	17,573	51,452	29,710
Capital expenditures	10,990	4,070	20,047	14,129
Revenues	77,343	76,317	160,569	131,893
Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Soda and sulfur services
Segment Reporting Information [Line Items]
Revenues	(2,222)	(2,584)	(4,480)	(4,918)
Intersegment | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	2,222	2,581	4,480	4,717
Intersegment | Marine transportation
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 3	$ 0	$ 201