Business Segment Information (Schedule of Revenues by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total Segment Margin	$ 827,062	$ 770,055	$ 617,729
Total revenues	3,176,996	2,788,957	2,125,476
Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	382,154	319,045	278,459
Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	1,734,248	1,248,085	964,632
Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	327,464	293,295	190,827
Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total revenues	733,130	928,532	691,558
Operating Segments
Segment Reporting Information [Line Items]
Total Segment Margin	827,062	770,055	617,729
Capital Expenditures	691,329	460,926	316,729
Total revenues	3,176,996	2,788,957	2,125,476
Operating Segments | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total Segment Margin	406,672	363,373	317,560
Capital Expenditures	410,237	241,446	50,546
Total revenues	377,842	319,045	278,459
Operating Segments | Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total Segment Margin	282,014	306,718	166,773
Capital Expenditures	219,393	174,518	227,118
Total revenues	1,743,327	1,258,236	973,354
Operating Segments | Marine Transportation
Segment Reporting Information [Line Items]
Total Segment Margin	110,423	66,209	34,572
Capital Expenditures	42,681	39,084	34,456
Total revenues	327,464	292,925	188,011
Operating Segments | Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total Segment Margin	27,953	33,755	98,824
Capital Expenditures	19,018	5,878	4,609
Total revenues	728,363	918,751	685,652
Intersegment
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Intersegment | Offshore Pipeline Transportation
Segment Reporting Information [Line Items]
Total revenues	4,312	0	0
Intersegment | Soda and Sulfur Services
Segment Reporting Information [Line Items]
Total revenues	(9,079)	(10,151)	(8,722)
Intersegment | Marine Transportation
Segment Reporting Information [Line Items]
Total revenues	0	370	2,816
Intersegment | Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total revenues	$ 4,767	$ 9,781	$ 5,906