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Equity-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Service-Based And Performance-Based Awards A summary of our phantom unit activity for our service-based and performance-based awards is set forth below:
 
 Service-Based AwardsPerformance-Based Awards
 Number of
Phantom
Units		Average
Grant
Date Fair
Value		Total
Value
(in thousands)		Number of
Phantom
Units		Average
Grant
Date Fair
Value		Total
Value
(in thousands)
Unvested at December 31, 2019148,077 $27.85 $4,124 162,771 $32.02 $5,214 
Granted107,572 $5.86 630 — $— — 
Forfeited(244)$32.43 (8)(367)$32.43 (12)
Settled(89,743)$32.24 (2,893)(162,404)$32.03 (5,202)
Unvested at December 31, 2020165,662 $11.19 $1,853 — $— $— 
Schedule of Equity-Based Compensation Expense Equity-based compensation expense (credit) during the three years ended December 31, 2020 was as follows:
 
Expense(Credit) Related to Equity-Based Compensation Plans
Consolidated Statement of Operations202020192018
Onshore facilities and transportation operating costs$(209)$250 $140 
Marine transportation operating costs(51)173 183 
Sodium minerals and sulfur services operating costs(115)140 112 
Offshore pipeline operating costs(277)269 297 
General and administrative expenses(333)1,087 1,239 
Total$(985)$1,919 $1,971