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Equity-Based Compensation Plans
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Equity-Based Compensation Plans Equity-Based Compensation Plans
2010 Long Term Incentive Plan
In 2010, we adopted the 2010 Long-Term Incentive Plan (the “2010 Plan”). The 2010 Plan provides for the awards of phantom units and distribution equivalent rights to members of our board of directors and employees who provide services to us. Phantom units are notional units representing unfunded and unsecured promises to pay to the participant a specified amount of cash based on the market value of our common units should specified vesting requirements be met. Distribution equivalent rights (“DERs”) are tandem rights to receive on a quarterly basis a cash amount per phantom unit equal to the amount of cash distributions paid per common unit. The 2010 Plan is administered by the Governance, Compensation and Business Development Committee (the “G&C Committee”) of our board of directors. The G&C Committee (at its discretion) designates participants in the 2010 Plan, determines the types of awards to grant to participants, determines the number of units to be covered by any award, and determines the conditions and terms of any award including vesting, settlement and forfeiture conditions.
The compensation cost associated with the phantom units is re-measured each reporting period based on the market value of our common units, and is recognized over the vesting period. The liability recorded for the estimated amount to be paid to the participants under the 2010 Plan is adjusted to recognize changes in the estimated compensation cost and
vesting. Management’s estimates of the fair value of these awards granted in 2019 are adjusted for assumptions about expected forfeitures of units prior to vesting. For our performance-based awards, our fair value estimates are weighted based on probabilities for each performance condition applicable to the award.
During 2019, we granted 29,606 phantom units with tandem DERs at a weighted average grant fair value of $21.28 per unit. During 2018, we granted 28,484 phantom units with tandem DERs at a weighted average grant date fair value of $22.12 per unit. During 2017, we granted 297,214 phantom units with tandem DERs at a weighted average grant date fair value of $32.37 per unit. The phantom units granted during 2019 and 2018 were made only to directors. Awards to management and other key employees during 2019 and 2018 were made under the 2018 LTIP plan, and were non-equity based awards. The phantom units granted during 2017 were both service-based and performance-based awards. The service-based awards vest on the third anniversary of the date of grant. Performance-based phantom unit awards granted in 2017 will vest on the third anniversary of issuance, in an amount ranging from 0% to 150% of the targeted number of phantom units, if certain quarterly cash distribution per common unit targets are achieved in the fourth quarter of 2020. If the quarterly cash distribution per common unit is below the threshold target, all of the performance-based phantom units granted will be forfeited.

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


At December 31, 2019, we estimated the unrecognized compensation cost of our phantom awards to be approximately $0.2 million to be recognized over a weighted average period of approximately 0.3 years. We recorded a charge of $1.8 million and $2.1 million to compensation expense for the years ended December 31, 2019 and 2018, respectively. Our liability for these awards totaled $2.8 million and $3.3 million at December 31, 2019 and 2018, respectively.

Equity-Based Compensation Plan 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
)