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Equity-Based Compensation Plans (Tables)
 12 Months Ended
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
)