Revenue Recognition (Disaggregated Revenue) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 449,251,000	$ 414,001,000	$ 1,427,801,000	$ 1,189,660,000
Current Assets - Other	2,679,000		2,679,000		$ 32,000
Other Assets, net of amortization	4,964,000		4,964,000		7,469,000
Accrued Liabilities	43,484,000		43,484,000		26,982,000
Other Long-Term Liabilities	129,487,000		129,487,000		$ 78,946,000
Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	247,168,000	241,123,000	748,319,000	665,859,000
Product sales
Disaggregation of Revenue [Line Items]
Total revenues	191,121,000	157,480,000	635,089,000	469,628,000
Sulfur services
Disaggregation of Revenue [Line Items]
Total revenues	10,962,000	15,398,000	44,393,000	54,173,000
Offshore pipeline transportation
Disaggregation of Revenue [Line Items]
Total revenues	138,632,000	143,306,000	446,060,000	377,563,000
Offshore pipeline transportation | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	138,632,000	143,306,000	446,060,000	377,563,000
Offshore pipeline transportation | Product sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Offshore pipeline transportation | Sulfur services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Marine transportation
Disaggregation of Revenue [Line Items]
Total revenues	90,064,000	77,058,000	251,052,000	237,319,000
Marine transportation | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	90,064,000	77,058,000	251,052,000	237,319,000
Marine transportation | Product sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Marine transportation | Sulfur services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Onshore transportation and services
Disaggregation of Revenue [Line Items]
Total revenues	220,555,000	193,637,000	730,689,000	574,778,000
Onshore transportation and services | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	18,472,000	20,759,000	51,207,000	50,977,000
Onshore transportation and services | Product sales
Disaggregation of Revenue [Line Items]
Total revenues	191,121,000	157,480,000	635,089,000	469,628,000
Onshore transportation and services | Sulfur services
Disaggregation of Revenue [Line Items]
Total revenues	$ 10,962,000	$ 15,398,000	$ 44,393,000	$ 54,173,000