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Derivatives (Schedule of Effect on Operating Results) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Commodity derivatives - futures and call options |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in Income | $ (2,030) | $ (9,186)
Natural Gas Swap | Soda and sulfur services operating costs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in Income | 3,010 |
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 | (2,918) | 967
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 | $ 888 | (10,153)
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 |  | $ 14,085

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