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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Summary 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, 2016 | 181,230 |  |  | $ | 40.59 |  |  | $ | 7,356 |  |  | 483,232 |  |  | $ | 38.82 |  |  | $ | 18,757 |
Granted | 102,868 |  |  | $ | 32.27 |  |  | 3,320 |  |  | 194,346 |  |  | $ | 32.43 |  |  | 6,303 |
Forfeited | (3,402 | ) |  | $ | 37.22 |  |  | (127 | ) |  | (17,410 | ) |  | $ | 35.43 |  |  | (617 | )
Settled | (40,859 | ) |  | $ | 53.84 |  |  | (2,200 | ) |  | (77,793 | ) |  | $ | 54.18 |  |  | (4,215 | )
Unvested at December 31, 2017 | 239,837 |  |  | $ | 34.81 |  |  | $ | 8,349 |  |  | 582,375 |  |  | $ | 34.73 |  |  | $ | 20,228 |
Expense Related To Equity-Based Compensation Plans | Equity-based compensation expense during the three years ended December 31, 2017 was as follows:
|  | Expense Related to Equity-Based Compensation Plans
Consolidated Statement of Operations |  | 2017 |  | 2016 |  | 2015
Onshore facilities and transportation operating costs |  | $ | (1,137 | ) |  | $ | 1,688 |  |  | $ | 1,185 |
Marine transportation operating costs |  | (483 | ) |  | 1,089 |  |  | 851 |
Sodium minerals and sulfur services operating costs |  | (533 | ) |  | 547 |  |  | 227 |
Offshore pipeline operating costs |  | (152 | ) |  | 681 |  |  | 94 |
General and administrative expenses |  | (2,272 | ) |  | 4,575 |  |  | 4,565 |
Total |  | $ | (4,577 | ) |  | $ | 8,580 |  |  | $ | 6,922 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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