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Equity-Based Compensation Plans (Expense Related to Equity-Based Compensation Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | $ 1,416 | $ (985) | $ 1,919
Cost of goods and services sold | Onshore facilities and transportation |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | 0 | (209) | 250
Cost of goods and services sold | Marine transportation |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | 0 | (51) | 173
Cost of goods and services sold | Sodium minerals and sulfur services |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | 0 | (115) | 140
Cost of goods and services sold | Offshore pipeline transportation |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | 0 | (277) | 269
General and administrative expenses |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | $ 1,416 | $ (333) | $ 1,087

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