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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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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 Awards |  | Performance-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, 2019 | 148,077 |  |  | $ | 27.85 |  |  | $ | 4,124 |  |  | 162,771 |  |  | $ | 32.02 |  |  | $ | 5,214 |
Granted | 107,572 |  |  | $ | 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, 2020 | 165,662 |  |  | $ | 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 Operations |  | 2020 |  | 2019 |  | 2018
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 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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