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Equity-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2017
239,837

 
$
34.81

 
$
8,349

 
582,375

 
$
34.73

 
$
20,228

Granted
28,484

 
$
22.12

 
630

 
—

 
$
—

 
—

Forfeited
(17,073
)
 
$
31.46

 
(537
)
 
(67,266
)
 
$
33.49

 
(2,253
)
Settled
(55,309
)
 
$
44.92

 
(2,484
)
 
(137,103
)
 
$
45.40

 
(6,224
)
Unvested at December 31, 2018
195,939

 
$
30.40

 
$
5,958

 
378,006

 
$
31.09

 
$
11,751
Schedule of Equity-Based Compensation Expense
Equity-based compensation expense during the three years ended December 31, 2018 was as follows:
 
 
 
Expense Related to Equity-Based Compensation Plans
Consolidated Statement of Operations
 
2018
 
2017
 
2016
Onshore facilities and transportation operating costs
 
$
140

 
$
(1,137
)
 
$
1,688

Marine transportation operating costs
 
183

 
(483
)
 
1,089

Sodium minerals and sulfur services operating costs
 
112

 
(533
)
 
547

Offshore pipeline operating costs
 
297

 
(152
)
 
681

General and administrative expenses
 
1,239

 
(2,272
)
 
4,575

Total
 
$
1,971

 
$
(4,577
)
 
$
8,580