Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Segment margin	$ 195,129	$ 157,452
Total revenues	790,612	631,947
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	91,395	68,068
Sodium Minerals and Sulfur Services [Member]
Segment Reporting Information [Line Items]
Total revenues	444,648	285,674
Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	171,343	222,431
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	83,226	55,774
Operating Segments
Segment Reporting Information [Line Items]
Segment margin	195,129	157,452
Capital expenditures	83,025	72,563
Total revenues	790,612	631,947
Operating Segments | Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	97,938	70,904
Capital expenditures	52,053	35,441
Total revenues	91,395	68,068
Operating Segments | Sodium Minerals and Sulfur Services [Member]
Segment Reporting Information [Line Items]
Segment margin	66,107	67,375
Capital expenditures	19,985	26,326
Total revenues	446,906	288,008
Operating Segments | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	5,390	7,036
Capital expenditures	1,930	737
Total revenues	169,085	220,295
Operating Segments | Marine Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	25,694	12,137
Capital expenditures	9,057	10,059
Total revenues	83,226	55,576
Intersegment
Segment Reporting Information [Line Items]
Total revenues	0	0
Intersegment | Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	0	0
Intersegment | Sodium Minerals and Sulfur Services [Member]
Segment Reporting Information [Line Items]
Total revenues	(2,258)	(2,334)
Intersegment | Onshore Facilities and Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	2,258	2,136
Intersegment | Marine Transportation [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 0	$ 198