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Equity-Based Compensation Plans (Tables)
 12 Months Ended
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