Derivatives (Schedule of Effect on Operating Results) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Level 3 | Preferred Distribution Rate Reset Election
Derivative Instruments, Gain (Loss) [Line Items]
Preferred Distribution Rate Reset Election	$ 0	$ (24,977)	$ 0	$ (18,584)
Commodity derivatives - futures and call options
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(8,391)	9,223	(18,330)	16,967
Natural Gas Swap | Soda and sulfur services operating costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	8,600		15,086
Preferred Distribution Rate Reset Election
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	12,300		17,700	(2,500)
Contracts designated as hedges under accounting guidance | Commodity derivatives - futures and call options | Onshore facilities and transportation product costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(5,012)	2,085	(2,657)	1,549
Contracts not considered hedges under accounting guidance | Commodity derivatives - futures and call options | Onshore facilities and transportation product costs, Soda and sulfur services operating costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (3,379)	7,138	$ (15,673)	15,418
Contracts not considered hedges under accounting guidance | Natural Gas Swap | Soda and sulfur services operating costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income		$ (489)		$ (2,181)