Business Segment Information (Schedule of Revenues by Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 2,966,216,000	$ 3,176,996,000	$ 2,788,957,000
Total Segment Margin	673,043,000	827,062,000	770,055,000
Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	404,919,000	382,154,000	319,045,000
Total Segment Margin	332,786,000	406,672,000	363,373,000
Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	1,540,723,000	1,734,248,000	1,248,085,000
Total Segment Margin	183,486,000	282,014,000	306,718,000
Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	321,616,000	327,464,000	293,295,000
Total Segment Margin	125,003,000	110,423,000	66,209,000
Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total revenues	698,958,000	733,130,000	928,532,000
Total Segment Margin	31,768,000	27,953,000	33,755,000
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	2,966,216,000	3,176,996,000	2,788,957,000
Segment Operating Expenses	(1,737,602,000)	(1,864,429,000)	(1,322,990,000)
Segment Product Costs	(599,925,000)	(637,179,000)	(828,152,000)
Other Segment Items	44,354,000	151,674,000	132,240,000
Operating Segments | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	404,919,000	377,842,000	319,045,000
Segment Operating Expenses	(117,207,000)	(96,025,000)	(99,881,000)
Segment Product Costs	0	0	0
Other Segment Items	45,074,000	120,543,000	144,209,000
Operating Segments | Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	1,549,060,000	1,743,327,000	1,258,236,000
Segment Operating Expenses	(1,352,044,000)	(1,479,425,000)	(926,743,000)
Segment Product Costs	0	0	0
Other Segment Items	(5,193,000)	27,191,000	(14,624,000)
Operating Segments | Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	321,616,000	327,464,000	292,925,000
Segment Operating Expenses	(196,602,000)	(218,403,000)	(228,300,000)
Segment Product Costs	0	0	0
Other Segment Items	(11,000)	1,362,000	1,214,000
Operating Segments | Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total revenues	690,621,000	728,363,000	918,751,000
Segment Operating Expenses	(71,749,000)	(70,576,000)	(68,066,000)
Segment Product Costs	(599,925,000)	(637,179,000)	(828,152,000)
Other Segment Items	4,484,000	2,578,000	1,441,000
Intersegment
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Intersegment | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	0	4,312,000	0
Intersegment | Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	(8,337,000)	(9,079,000)	(10,151,000)
Intersegment | Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	0	0	370,000
Intersegment | Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total revenues	$ 8,337,000	$ 4,767,000	$ 9,781,000