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Derivatives (Effects on Consolidated Statements of Operations and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Embedded Derivative Financial Instruments | Other income (expense) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives, amount of gain (loss) recognized in income | $ (857) | $ (9,026) | $ 8,360
Designated as Hedging Instrument | Commodity Derivatives | Cost of goods and services sold | Onshore facilities and transportation product costs |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives, amount of gain (loss) recognized in income | (14,454) | (786) | (544)
Not Designated As Hedging Instrument | Commodity Derivatives | Cost of goods and services sold |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives, amount of gain (loss) recognized in income | (19,929) | (8,576) | 3,370
Not Designated As Hedging Instrument | Commodity Derivatives | 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] |  |  |
Derivatives, amount of gain (loss) recognized in income | (5,475) | (7,790) | 3,914
Not Designated As Hedging Instrument | Swap | Cost of goods and services sold | Sodium minerals and sulfur services operating costs |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives, amount of gain (loss) recognized in income | $ 1,186 | $ 1,941 | $ 1,906

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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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