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Unit-Based Compensation
 3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Unit-Based Compensation
Unit-Based Compensation
The Partnership has issued phantom units to its employees and non-employee directors, which vest 60% after three years and 40% after five years. Phantom units have the right to receive distributions prior to vesting. The fair value of these units is the market price of our common units on the grant date, and is amortized over the five-year vesting period using the straight-line method. Unit-based compensation expense related to the Partnership included in our Consolidated Statements of Operations and Comprehensive Income was $3 million and $4 million for the three months ended March 31, 2018 and 2017, respectively. The total fair value of phantom units vested during the three months ended March 31, 2018 and 2017, was $5 million and $0.4 million, respectively, based on the market price of SUN’s common units as of the vesting date. Unrecognized compensation cost related to our nonvested restricted phantom units totaled $27 million as of March 31, 2018, which is expected to be recognized over a weighted average period of 3.78 years. The fair value of nonvested phantom units outstanding as of March 31, 2018 totaled $56 million.
A summary of our phantom unit award activity is as follows:
 
Number of Phantom Common Units
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2016
2,013,634

 
$
34.43

Granted
203,867

 
28.31

Vested
(289,377
)
 
45.48

Forfeited
(150,823
)
 
34.71

Outstanding at December 31, 2017
1,777,301

 
31.89

Granted
420,300

 
28.86

Vested
(169,996
)
 
28.18

Forfeited
(214,344
)
 
31.93

Outstanding at March 31, 2018
1,813,261

 
$
30.96