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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | $ (985) | $ 1,919 | $ 1,971
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 | (209) | 250 | 140
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 | (51) | 173 | 183
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 | (115) | 140 | 112
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 | (277) | 269 | 297
General and administrative expenses |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Expense related to equity-based compensation plan | $ (333) | $ 1,087 | $ 1,239

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