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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2018 | 195,939 |  |  | $ | 30.40 |  |  | $ | 5,958 |  |  | 378,006 |  |  | $ | 31.09 |  |  | $ | 11,754 |
Granted | 29,606 |  |  | $ | 21.28 |  |  | 630 |  |  | — |  |  | $ | — |  |  | — |
Forfeited | (1,098 | ) |  | $ | 32.43 |  |  | (36 | ) |  | (1,653 | ) |  | $ | 32.43 |  |  | (54 | )
Settled | (76,370 | ) |  | $ | 31.79 |  |  | (2,428 | ) |  | (213,582 | ) |  | $ | 30.37 |  |  | (6,486 | )
Unvested at December 31, 2019 | 148,077 |  |  | $ | 27.85 |  |  | $ | 4,124 |  |  | 162,771 |  |  | $ | 32.02 |  |  | $ | 5,214 |
Schedule of Equity-Based Compensation Expense | Equity-based compensation expense during the three years ended December 31, 2019 was as follows:
|  | Expense Related to Equity-Based Compensation Plans
Consolidated Statement of Operations |  | 2019 |  | 2018 |  | 2017
Onshore facilities and transportation operating costs |  | $ | 250 |  |  | $ | 140 |  |  | $ | (1,137 | )
Marine transportation operating costs |  | 173 |  |  | 183 |  |  | (483 | )
Sodium minerals and sulfur services operating costs |  | 140 |  |  | 112 |  |  | (533 | )
Offshore pipeline operating costs |  | 269 |  |  | 297 |  |  | (152 | )
General and administrative expenses |  | 1,087 |  |  | 1,239 |  |  | (2,272 | )
Total |  | $ | 1,919 |  |  | $ | 1,971 |  |  | $ | (4,577 | )

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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