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Derivatives (Schedule of Effect on Operating Results) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Commodity derivatives - futures and call options | Cost of Goods and Services Sold |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income | $ 321 | $ 1,600 | $ (13,903) | $ (7,210)
Natural Gas Swap Liability | Cost of Goods and Services Sold | Sodium minerals and sulfur services operating costs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income | 666 | 81 | 1,217 | 1,316
Preferred Distribution Rate Reset Election | Other income, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income | 6,689 | 7,974 | 17,395 | 306
Contracts designated as hedges under accounting guidance | Commodity derivatives - futures and call options | Cost of Goods and Services Sold | Onshore facilities and transportation product costs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income | (854) | 227 | (11,061) | (492)
Contracts not considered hedges under accounting guidance | Commodity derivatives - futures and call options | Cost of Goods and Services Sold | Onshore facilities and transportation product costs, sodium minerals and sulfur services operating costs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income | $ 1,175 | $ 1,373 | $ (2,842) | $ (6,718)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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