Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	$ 714,297	$ 807,618	$ 2,240,663	$ 2,402,892
Other Assets, net of amortization	1,788		1,788		$ 859
Accrued Liabilities	38,631		38,631		11,460
Other Long-Term Liabilities	92,317		92,317		$ 112,734
Offshore pipeline transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	101,119	106,297	302,133	289,151
Soda and sulfur services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	370,065	423,575	1,161,007	1,331,078
Marine transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	78,496	80,220	243,941	240,789
Onshore facilities and transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	164,617	197,526	533,582	541,874
Fee-based revenues
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	197,059	203,286	597,241	574,790
Fee-based revenues | Offshore pipeline transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	101,119	106,297	302,133	289,151
Fee-based revenues | Soda and sulfur services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Fee-based revenues | Marine transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	78,496	80,220	243,941	240,789
Fee-based revenues | Onshore facilities and transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	17,444	16,769	51,167	44,850
Product Sales
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	500,192	580,086	1,583,063	1,759,478
Product Sales | Offshore pipeline transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Product Sales | Soda and sulfur services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	353,019	399,329	1,100,648	1,262,454
Product Sales | Marine transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Product Sales | Onshore facilities and transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	147,173	180,757	482,415	497,024
Refinery Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	17,046	24,246	60,359	68,624
Refinery Services | Offshore pipeline transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Refinery Services | Soda and sulfur services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	17,046	24,246	60,359	68,624
Refinery Services | Marine transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Refinery Services | Onshore facilities and transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0