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Equity-Based Compensation Plans (Expense Related to Equity-Based Compensation Plans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Expense related to equity-based compensation plan $ 1,919 $ 1,971 $ (4,577)
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 250 140 (1,137)
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 173 183 (483)
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 140 112 (533)
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 269 297 (152)
General and administrative expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Expense related to equity-based compensation plan $ 1,087 $ 1,239 $ (2,272)